While I disagree on the "job identity" part (the fairy stuff has been there since level 30,) it's certainly one of those things where players generally spend a lot of time customizing their model and don't want "optimal play" to require specific gear. I remember a part of a different MMO that predates XIV, that the "most powerful" transform that the player could have basically lasted a whole minute, and while transformed they could basically wipe the floor with most content. THAT I want to see avoided.

I agree that a soft-toggle (like visor up/down) would be fine in this case, and maybe substitute a "just the wings" version (since we know there are wings on two outfits and one apparel wings, we know they can do this.) "/glam seraphism none|wings|off"