This responce was okay 5 years ago, now with almost all modern MMOs offering way more customization for the player characters looks, FFXIV is falling behind and need to overlook stuff like this.
I agree that Artifact armor (lvl45-40af1) af2 (ilvl90af2) and af3 (Eso) should be the only exception to this, for the rest the devs need to ease up on this restriction.
The only thing that has "identity" nowadays is the Artifact armor and that could stay as is.
Also the excuse that it doesn't work in PVP or 24man raiding is laughable, like said earlier you can glamour Bikini tops, mini skirts or just nothing at all as ANY class, you still have to tell by looking at their weapon and what skills they use, if glamour restrictions where liften somewhat this wouldn't change anything.
Either way, its a nice option for people to have that want to use it, its not going to hurt anyone's fun (seriously if you have issues with tank wearing healer outfit, then how do you not have same issue with them in speedos llike what is currently avaliable for glamour?) so its about time SE overlook this outdated policy.
If you don't like it oyu can stick to whatever glamour fits your fancy but don't stand in way of others getting the chance to create their dream look wihtout any good excuse for it.