We don't need more inventory space. Players need to learn how to manage their inventories. Adding more space is redundant and a complete waste of developer time because players will just fill up those slots, and again ask for more inventory. We do need a certain amount, obviously, and the amount we have is already generous in comparison to the amount of tasks we are actively participating in at any given time.

You should never max out your retainers or your own inventories, armories, and saddlebags. Figure out what you need the least, or the least inconvenient to acquire, and patch it. Repeat process until you get some space back.