I'm waiting for the end product. He's an attacker. Attacker score goals and help directly to create goals. Without that, he's half the player. Some may not like it, but I stick to that. So, preferably goals, and assists.
I can be sympathetic if some players (Raphinha, Ferran) stupidly miss chances he sets on a plate for them, but not enough of that in big games either for the amount of actions that go through him.
For me, his end product has taken a dive in big games this season. And that's what the big players do.
Most chances created + big chances created in the team (and whole Laliga).
If you focus on just "big games", then:
Vs Qsg, 1 big chance for Ferran.
Vs RM in the league, 1 great pass to Kounde at the end which could be a big chance if Kounde didn't miscontrol the ball.
Vs Chelsea, 1 sitter created for Ferran right beginning of the match.
Vs Atletico in the league, 2 big chances created.
Vs RM in super cup, 1 big chance created.
So he mostly created chances for his teammates. Not his fault if they can't convert.