I do hate inventory management in FFXIV. It's some of the worst I've come across and I hate that it feels like it's this way so they can charge me extra money for retainers. Every decision seems to be towards frustration.
Can't craft from retainers
Can't use bait from saddlebags
Can't do turn-ins from saddlebags
Can't organize retainers by what you want them to store
Can't collect glamours, only gear
Can't bulk dump gear into retainers (better, but still one-by-one)
Can't view all your retainer inventory at once
Can't filter your retainer inventory
Can't sell more than 20 items per retainer
Can't have toys without using inventory space
And for all the complaints of hording. A lot of that could be solved by uncapping the market selling or at least dramatically expanding it.