If that were the case they'd probably be less eager to throw in new casual glamour pieces every major patch. They seem quite happy to throw in more and more such options. The sweater and jeans clad characters are no more displaying a class identity than the bikini ones.
This is true but the main argument Yoshi-P has used against easing job restrictions is being able to look at a character and see their job which as stated is out the window already with bikini's, casual glams and costume glams.Also as I see it, regarding aesthetics rather than practical defence, a healer in bikini and tank in bikini are both equally "not wearing proper battle outfits" for their role.
To my mind that purpose is adequately filled by weapons and battle animations/stances. I don't think anybody is advocating glamouring Chakrams onto axes and guns on katana, as that would mess up animations.