Definitely a case of that with some people, but generally he still has a lot more to show... He has certain aspects of his game that he is doing very well and it's showing in the stats but others that he isn't doing anywhere near to how he used to at Dortmund and again, it's showing in the stats.
Sancho this season:
Here is his 20/21 season compared to the Bundesliga, what we thought we were getting:
The shots have completely dried up, the actual creation has completely dried up, and he's not involved enough in general play compared to how he used to be, but he's still elite at just getting it in the box and his around the box play. He isn't turning it into enough quality chances though. Once he starts doing that, then you'd have more people happy with him... As it is, his performances range from "invisible" to "decent", rarely having a very good one.
Yeah, he's not on the same level, no doubt about that. But I wonder how much of that is down to him joining a rather dysfunctional team after player in a very well organized one.
But you're right, he can absolutely do more. I just think the criticism is still a bit harsh because decent performances are seen as average ones because of his playing style.