We all have different opinions on many players, but my opinion is that we don't 'get rid' of players because they can't cut it at 20 years of age in one of the toughest leagues in the world.
The problem with some posters is that they think that if you don't agree that x, y or z player is 'average', then you think that x, y or z is going to be brilliant, which in the vast majority of occasions is simply not true. Salah and De Bruyne may be exceptions, but a lot of players emerge later to have a decent career in professional football, nothing is black or white, most is various shades of grey.
Amad was bought by the club because he showed the potential that he could be a very good player, and yes, he hasn't progressed too far at the moment, and does look lightweight and lacking in some areas, but with a full season loan to a club that will play him regularly may address some of those issues, realistically who really knows.