I understand the need of limited storage from a gameplay perspective but my time in FF14 where it is a constant hassle has really soured me on it. So I'm not even going to get into that, but one thing Final Fantasy 14 did do was a command called /isearch which would just search all your various retainers, armory tabs, and armoire all at once telling you where something was.

Since this game seems like it's going to have a lot of disconnected storage chests I think this would be a nice QoL addition and it really made FF14's storage issues less miserable. I'm just assuming this is feasible since FF14 seems to quote technical limitations for almost every problem yet managed to implement this. Though the underlying guts of how each games inventory is designed may be different.