I am not sure you will get a lot of rational thinking and logic behind all of this. Eorzea seems to combine armour and weapons tracing back to Antiquity and the Roman era (Ul'dah and gladiator garbs especially), savage tribes, hordes or mongols (miqo'te tribes, xaelas, etc) up to low middle-age (Gridania) and high middle-age (Ishgard), or even Carribean pirates (Limsa).
So... I think the point is that magic, aether and all that jazz tends to screw up a lot with things and basically in Eorzea, the only rationale is that magicks always tend to trump technology.
Unless technology rises to such levels that it can be a match or even outmatch Magi (like Magitek, or Allagan relics). And even then, I bet that Sharlayan, or especially Mhachi, Amdapori and Nym Magi was probably a match to the wonders of Magitek or even Allag.
So... I think the point is that magic, aether and all that jazz tends to screw up a lot with things and basically in Eorzea, the only rationale is that magicks always tend to trump technology.
Unless technology rises to such levels that it can be a match or even outmatch Magi (like Magitek, or Allagan relics). And even then, I bet that Sharlayan, or especially Mhachi, Amdapori and Nym Magi was probably a match to the wonders of Magitek or even Allag.
Balmung:Â Suen Shyu