The people who hate him often tend to forget why he was signed..
Bernardo wanted to leave
So his main purpose was going to be double pivot and box to box midfielder that eases the pressure on our defenders when we build from the back.. and takes the ball upfield.
Bernardo almost never loses the ball and what is Grealish really good at? never losing the ball.
He often runs into the same positions Gundogan and Bernardo take up.
I think he'll never really be appreciated while Bernardo and Gundogan are here, but as its very likely that we lose both after this season.. Grealish picks up the slack and we've seamlessly transitioned to Grealish as the left center mid.
The strange thing is if you remember Gundo used to get a lot of hate and called names but after David Silva moved on.. you all saw how important Gundogan was to the system. We didn't really appreciate him till Fernandinho went down and he filled in as a 6 in 18-19. But now he's our captain!
Bottom line is neither Bernardo nor Grealish are 20 assist/ 20 goal midfielders.