I bet you could NPC 50 things right now if you wanted to.
300 slots + crystal tab + currency tab + 30 bazaar spots, i feel this is pretty generous.
A major part of playing an MMO that isn't care bear, is Inventory Management.
In FFXI choices were made between levelling Jobs or taking part in quests because of inventory restrictions and for years it was blamed on PS2 limitations, now there are sacks, bags and safes everywhere lol.
IDK, i guess just hold tight until FFXIV goes P2P and we can buy more retainers. ^^