No one cares if Asllani should be playing at another role. Just like you don't care that Frattesi would have been better in another role.
Asllani looks and is like the team's weakest link because he occupies a spot he has no idea how to react in, how to move off the ball, how to move with the ball, heck the earth spins twice before he turns once with the ball, he's too sloppy with his touch for someone in midfield and defensively he's not helping either actively or tactically, leaving the team exposed to a lot of bad options because his role is to always create the best option, either to him, either by moving and attracting a defender away from another's passing lane.
He fails in almost every category.
Can he pass and shoot? Sure he can. So what?
Frattesi not finishing a chance isn't something that holds water as criticism. It's ridiculous nitpicking. You can say that Frattesi cannot carry the ball to the fraction of how Barella or Mkhitaryan do and can be detrimental to our attacking flow when he has to participate before the execution and you'd be onto something.