Sacks are not a QB stat. They are a team stat because many things contribute to those numbers including OL play, how good your RBs are picking up blitzes, play calls, play design, how good your QB and WR are at both recognizing when to go to a hot route, how good the QB is at moving in the pocket, and how good a QB is at throwing it away when all else fails.
Carr is good at throwing it away when all else fails which is why he has low sack numbers, but he's not consistently good at the rest. And, I think you would prefer a guy who buys more time and might take a few more sacks while also making more plays with his arm or running when Carr would have just thrown it away.