I've always viewed him as very pacey, in line with this the way Barca play him is to have him isolate the FB or run behind them, so to be clear he's not a dribble-past kind of player or ball carrier but one that holds the width.
If he's lost pace recently (maybe as a result of his injuries??) and I've not been paying attention, then fair enough.
Agree with you on his finishing but I'm not sure that's what Ange looking at him for, while there are of course lots of rotations, Ange's wide men do have a tendency to stay wide (or so I've been reading about)???