I only have one point. On the inventory thing. It's totally your own fault for wanting to hoarde everything.
You don't need to and you don't have to. The limited inventory space is there to make you focus on doing A rather than B. Not so you can do A, B, C and the rest of the alphabet .
It's even mentioned on the loading screen to not try and do everything but barter/trading with other players should be your way forward in many cases.