The extremely limited inventory space is a rather big one in my eyes. You can make do with 50 slots, but it's not exactly fun.
Also as far as cash grabbing goes, do note that Layering Wear was implemented the way it was to make more money by making basewear and innerwear consumables instead of parts like outfits/cast parts.
Edit: Just doing some math for my own amusement on the bare minimum general use of your inventory space.
- 3 Weapons
- 3 Units
- 2 Rings
- 1 Outfit (3 Cast Parts)
- 8 Shop Consumables such as mates, atomizers, essences
- 3 boosts consisting of exp, rdr, triboost
- 2 Misc from telepipes, half scape dolls
This comes out to 22 (24) slots taken up by basics alone. This can quickly go up by adding a weapon camo, additional rings, food, meseta boost, good gathering items, drinks, etc. Regardless you are looking at half your inventory being consumed at all times with 50 slots.