Why can't we just store partial sets?
I'll probably get down voted, but I play RS3 more than OS (mainly because it's my original account from back in the day.) This is a big problem for me. There are so many treasure trail sets it's ridiculous. 1/4 of my bank is items I can't store yet.
I answered a similar question a few moments ago:
It only applies to a minority of players. There's a game-mode called Ultimate Ironman which is based around the concept of seriously tough inventory management. Before the game change we polled Ultimate Ironman to ascertain how they'd prefer us to handle their accounts and item storage.
Other players can store and withdraw individual pieces as much as they'd like.