For what it's worth, here's his xG over the last 3 seasons (i.e. 19/20, 20/21, and the two games from 21/22). I've removed games where he played full-back, striker, or came on as a sub.
View attachment 12579
Based on that his end product in terms of assists isn't actually too bad. And it's not his finishing that's the issue, but rather getting goalscoring chances in the first place.
Also, in terms of dribbling vs losing possession, here are his stats from the last 3 seasons (taken from Whoscored), vs Saha and Son for the sake of comparison:
View attachment 12581
So as well as successfully dribbling much more than both of them, he only loses the ball as much as he successfully dribbles (whereas Zaha and Son lose the ball more than twice as often as they successfully dribble).