I agree and yet we totally fell apart as a side when him and Fred got injured
I generally don't have a problem with him being in our strongest 11 with the options that we've got. As much of a problem that I think he is, he still provides more stability and consistency to the team than Matic and Pogba generally do.
The big problem is that after all these years he's still arguably our second best central midfielder despite it being such an obvious issue (Fred being our best). We don't seem to have put any urgency into actually improving the position, which is unbelievable negligence by the club.
As for Scott himself I don't blame him for most of his limitations, but the two things he does that really do frustrate me is how he actively seems to position himself so that his team-mates can't pass him the ball, and how he is so lazy at getting back when the opposition get behind him. He's ok when the opposition are in front of him or within his reach, but once they get past him he just jogs back with no urgency at all. He's certainly not the only one in the team that does it, but it's extra frustrating with him considering that work-rate and drive are the things that he's supposedly best at.