You have to realize there is a difference in allowing any class/job to wear any item of the plethora of generic gear in the game and allowing any class/job wear something that was designed from the ground up to fit the specific aesthetic of a certain job. I've no problem with them unlocking any of the non-specific role gear for any other job or role, but I would be strongly against unlocking the AF gear.
1) FFXI has done this already. Surprisingly enough, the game didn't fall apart as a result
2) The "job aesthetic" argument already means nothing when, again, everyone is hopping in the DF in their swimsuits

Which seems to be the direction that Yoshi P is going anyway. So rather than making threads asking for something that they are apparently already in the process of doing, why not start some sort of "master thread" for the popular items you would like them to prioritize unlocking?
I'm not interested in participating in such a thread because I think *all* the gear should just be unlocked. Bonus, this would almost certainly require less dev effort than just handpicking various things to be made universal glamour, and I'm kinda all for as much dev effort as possible being put toward actual new content.