Honestly they're not going to do anything about the inventory space. Everything listed above would be EXCELLENT ways to deal with any and all inventory issues, but that would lose them money from retainer sales.

They want your inventory full to bursting. They want you to have a mental breakdown when that one piece of loot you've been farming drops and your inventory is full. They want you to have to stress out as you struggle to decide which glamour item to throw away so you can make room for something new. They want you to beat yourself up because you threw out crafting mats that you didnt know you were going to need, and now you do. They want you to be enraged when you accidentally sell all your beast tribe tokens to an npc vendor.

Because the more upset you get, and annoyed, and irritated, the more likely you'll purchase additional retainers. The problem will never get fixed, because the problem is intentional.