YES, not enough inventory slots!
NO, just dismantle/discard what you don't want
Bump, we need unlimited vault space, why trow us a lot of great exotic weapons and armor if we have to sell them or trow them away? "Oh, you'll get better armor so trow away the other" no, I want to collect the things I work hard for. Please Bungie, Deej, who ever is reading this from the developers, make the vault unlimited to us.