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Let’s have some fun.
Regarding gear:
 NPCs follow the general rule. You don’t see a Black Mage or THM in pure plate and you don’t see a Paladin running into battle in monk gear or… a summoner’s coat. Even the bosses have some sort of consistency. (See Amon in cloth gear but basically a BLM… I think it only is Bard gear because …. All Bard specific gear is over the top and none of the other bosses ‘fit’ the Bard style. The various other bosses all drop sets that… oddly fit their style.) Why should players be the ones able to break that consistency? Not to mention breaking the standard gear style would break the aesthetic of the game. (What does aesthetic have to do with the game? I am pretty certain the people who design the gear, the mobs, and the world consider their work art rather than a game even if you don’t.) (I don’t know every NPC soo take that with salt)
Regarding lore:
If I am not mistaken most of the gear (the nice stuff) in imbued with a certain aetheric nature. The Aetherical Gear (Pink background) I BELIEVE is the result of the gear being imbued with the dying aether of the wearer. The Artifact gear and what not is specifically designed for the user to augment their skills and abilities. Since most of the abilities of the Characters of the FFXIV are aether based (unless you are Garlean then you have techno-punk stuff) it would make sense that the gear is meant to strengthen the wielder in supernatural and appropriate ways. If you wear the wrong stuff you could mess up your aetherical balance and be at a worse state.
 More generic gear probably is a bit harder to justify other than if you are wearing plate you are probably going to get stronger and have more stamina. Lighter and somewhat tighter in the right places gear would give you more agility in combat. Mind and intelligence I do not have an answer.
Regarding RP:
Honestly… if you desperately want a look in RP (not PVE), just level the class. If it means enough to you that you want it badly, you will do it. If you are not willing to put in the effort you probably don’t want it that badly. There is a VAST amount of gear now anyone can use for glamour. If you want something specific you need to put in the effort this is a GAME before a medium for RP. The game is not designed for your singular ideals. Furthermore, when RPing… just because you are using the Paladin soul stone… it doesn’t mean you can’t RP being a BLM casting flare. (You might get some funny looks but so long as you have RP to back up the actions I don’t think anyone will say UN-UH your armor wouldn’t let you.)
Regarding PVE:
If you are upset you can’t look like a dragoon while healing... you are the special star not someone being limited by archaic designs. Once again it falls back to aesthetic, yours vs the developers. Frankly, the amount of ‘passion’ they put into the designs in this game pretty much cinches that they want a look for the game and while they will give players things to mess with (such as emperors gear) it will always be what the developer LIKES and PREFERS. There are enough all classes gear now to be able to get the look you are after most the time.
Regarding Discussion:
Just because someone says: “Well it is the dev’s call and they made a call†does not mean the person says it is useless to discuss it. The fact of the matter it is true. It may change sometime in the future when they need a bright bauble to get people’s attention. Not everything someone does not like needs a crusade. The developers are not trying to strike at people individually. Not being complacent does not mean trying to force things to what you specifically think is better. Calling out decisions as BACKWARD because you do not agree with them actually is more of ‘shutting down the discussion’ than saying well… devs do not want it; because you are not actually discussing it just saying it is wrong. Frankly, the entire argument reminds me of folks complaining the new car they got is the GT instead of the GTX.
(Uh... well didn't realize my account was Quur... I have two accounts? This is Iex for those curious... looks like I get to explore why the hell I have ... oh.. cause I made an account long time ago for the Wiki...)
Regarding gear:
 NPCs follow the general rule. You don’t see a Black Mage or THM in pure plate and you don’t see a Paladin running into battle in monk gear or… a summoner’s coat. Even the bosses have some sort of consistency. (See Amon in cloth gear but basically a BLM… I think it only is Bard gear because …. All Bard specific gear is over the top and none of the other bosses ‘fit’ the Bard style. The various other bosses all drop sets that… oddly fit their style.) Why should players be the ones able to break that consistency? Not to mention breaking the standard gear style would break the aesthetic of the game. (What does aesthetic have to do with the game? I am pretty certain the people who design the gear, the mobs, and the world consider their work art rather than a game even if you don’t.) (I don’t know every NPC soo take that with salt)
Regarding lore:
If I am not mistaken most of the gear (the nice stuff) in imbued with a certain aetheric nature. The Aetherical Gear (Pink background) I BELIEVE is the result of the gear being imbued with the dying aether of the wearer. The Artifact gear and what not is specifically designed for the user to augment their skills and abilities. Since most of the abilities of the Characters of the FFXIV are aether based (unless you are Garlean then you have techno-punk stuff) it would make sense that the gear is meant to strengthen the wielder in supernatural and appropriate ways. If you wear the wrong stuff you could mess up your aetherical balance and be at a worse state.
 More generic gear probably is a bit harder to justify other than if you are wearing plate you are probably going to get stronger and have more stamina. Lighter and somewhat tighter in the right places gear would give you more agility in combat. Mind and intelligence I do not have an answer.
Regarding RP:
Honestly… if you desperately want a look in RP (not PVE), just level the class. If it means enough to you that you want it badly, you will do it. If you are not willing to put in the effort you probably don’t want it that badly. There is a VAST amount of gear now anyone can use for glamour. If you want something specific you need to put in the effort this is a GAME before a medium for RP. The game is not designed for your singular ideals. Furthermore, when RPing… just because you are using the Paladin soul stone… it doesn’t mean you can’t RP being a BLM casting flare. (You might get some funny looks but so long as you have RP to back up the actions I don’t think anyone will say UN-UH your armor wouldn’t let you.)
Regarding PVE:
If you are upset you can’t look like a dragoon while healing... you are the special star not someone being limited by archaic designs. Once again it falls back to aesthetic, yours vs the developers. Frankly, the amount of ‘passion’ they put into the designs in this game pretty much cinches that they want a look for the game and while they will give players things to mess with (such as emperors gear) it will always be what the developer LIKES and PREFERS. There are enough all classes gear now to be able to get the look you are after most the time.
Regarding Discussion:
Just because someone says: “Well it is the dev’s call and they made a call†does not mean the person says it is useless to discuss it. The fact of the matter it is true. It may change sometime in the future when they need a bright bauble to get people’s attention. Not everything someone does not like needs a crusade. The developers are not trying to strike at people individually. Not being complacent does not mean trying to force things to what you specifically think is better. Calling out decisions as BACKWARD because you do not agree with them actually is more of ‘shutting down the discussion’ than saying well… devs do not want it; because you are not actually discussing it just saying it is wrong. Frankly, the entire argument reminds me of folks complaining the new car they got is the GT instead of the GTX.
(Uh... well didn't realize my account was Quur... I have two accounts? This is Iex for those curious... looks like I get to explore why the hell I have ... oh.. cause I made an account long time ago for the Wiki...)