
To be frank, there's really only a few sets of equipment that are technically (There's always ways to play things off) off limits as far as canon goes, and they're things like the Drachen Armor, the actual set of Warrior gear, as those are technically specific suits of armor that only has one existing set. There are, however, other sets like them, so it's easy enough to play it off as wearing a different set of a similar suit of armor. The mythology versions are also all replicas, so those are 100% canon.
Some people get up in armors over equipment they feel people shouldn't have, others don't. Really just depends on the person and their opinion on the matter. Some, like specific relic weapons and relic armor, are completely justified canonically as being something only one person can technically obtain.
RSE, however, is just... ...gear. There's nothing special to it, and it's by no means something that would ever be considered off limits to most people I would imagine.
Some people get up in armors over equipment they feel people shouldn't have, others don't. Really just depends on the person and their opinion on the matter. Some, like specific relic weapons and relic armor, are completely justified canonically as being something only one person can technically obtain.
RSE, however, is just... ...gear. There's nothing special to it, and it's by no means something that would ever be considered off limits to most people I would imagine.