Because a midfielder's job is as black and white as and only boils down to tackle or assist, attack or defend. In this day and age, yes. Especially in a two man midfield. It's a given that you can pass the ball, you've got to do something else too. Which is why he doesn't work in a 2 man midfield, this is known. But then, neither can Sanchez. We don't have a complete midfielder that can do everything (Gana is the closest we have) at an equally high level, in fact most teams in the world don't. Most midfielders have 1 or 2 strengths along with certain weaknesses and it's up to the manager to play to those strengths and minimize those weaknesses. It's unfair to criticize a player for aspects that were never the focus of their game to begin with. I'd trust Sanchez enough in a two but not Westwood. I think the very fact that Westwood can't play in a two is a bit damning, personally.