More carriers is a massive need. As is big, powerful, dynamic breakdown-hitters - not "breakdown specialists" in the since of a turnover specialist, but someone with the physique and ability to hit attacking breakdowns hard, blast out the opposition and create quick ball. I would argue that often the same player fulfils both carrying and ruck-smashing roles (Ewers being an example) - a big, dynamic guy with explosive power and good body position is likely to excel both in hitting contact and in hitting rucks. Ewers I already mentioned, Clifford probably fits that mould, sure there are others I'm forgetting. Haskell and Robshaw simply don't.
Another issue we clearly still have, and which I don't think will be fixed quickly but needs to be looked at, is our kick chase, and skills in the air. Not so much fielding opposition kicks (we are passable there I suppose), but chasing and recovering a garryowen. Honestly, we are embarrassingly poor at this. With the honourable exception of Mike Brown, there is not a single player I would back to regather a well-weighted up and under even once a game - half the time, in fact, we don't even seem to have a chaser, and much of the other half they mistime the chase and don't go up to challenge. It's a key weapon and we just straight up suck at it across the board.
FWIW, in my view Roko is the answer.