Always little too late on the upgrades. 400 items for 29 classes + some random armoire stuff. We're talking ~15 items per job. We have more items than that in AF gear alone for battle classes. Forget about raiding gear, crafted gear, your 2B outfits, your mogstation stuff, etc. etc. 3 expansions worth. The list goes on. That alone should be cause for concern.
But if any more needs to be added I would say who says we don't use them for glam? I have 400 items and maybe a whopping 20-30 I haven't used. Yet.
Next to that I have a retainer full of weapons and gear I love that I sometimes use when I build something around them or remember I have them when making a set. And I've thrown so much away because like you said I "didn't use them" (hell, I've thrown items away that I HAVE used, just for convenience). Needless to say I probably would have managed to do something with them had I had a system that worked better.
I'm far from being the only one in this situation. Whether there are enough of us to warrant a change is another matter. But our request certainly isn't misplaced or even unreasonable. There definitely is no "solution" for us currently