For me personally, inventory management is the most tedious thing in this game, and it is a lot more tedious than in other MMORPGs or RPGs. There is a lot that could be done to improve the inventory user experience, and I do believe with some work, the game could end up having a sleek and user friendly inventory system. I want to highlight some issues I commonly stumble upon:
Desynthesis is slow and clunky. Desynthesizing is my preferred way to get rid of gear that I don't want. I run a lot of dungeons, especially when I am levelling jobs. This often leads to a place when my armory is FULL of gear that I want to desynthesize. I'm not exaggerating when I say it had often taken me about 30 minutes to go through all of my armory slots. An improvement I would like to see here is some kind of faster desynthesis. Either let me select items to desynthesize in bulk, or at least speed up the process of selecting the items, and for the love of god allow me to ALWAYS SKIP THE POP UP that shows me what resources I got. I can see them in my inventory AND in chat already.
The item you want to desynthesize is unique/untradeable? Please waste more time. 90% of items I desynthesize are unique/untradeable. This single action that I have to repeat every single time is literally costing me hours of play time. I get it, you want people to be safe against accidentally desynthesizing something, give me an OPTION IN THE SETTINGS that I must willingly turn on and that makes this checkmark always checked.
While desynthesizing gear you stumble upon a gear with materia in it, or gear with extractible materia. What do you do? You waste more time. Imagine if the desynthesis pop-up had an option to automatically retrieve and extract materia from the item you are desynthesizing.
To extract materia, please waste your time. Right clicking every single piece of equipment is not compelling gameplay. I want to be able to extract materia in bulk. I want to be able to extract materia from all items in my armory chest too, with a single command.
After you SLOWLY retrieved the materia, extracted the materia and desynthesized your gear. All that's left is to store the extracted materials in some kind of storage or bank, right? Should be easy. Except it isn't, this step is a nightmare.