It's literally the managers job to improve the players though, either via coaching or tactics. Managers sometimes just have to work with what they have and get the best out of them squeezing every last drop both physically and tactically. They can't just expect too spend their way out of trouble every time there is a transfer window open. Bar a few stalwarts like Pickford, Coleman, Keane and DCL the team has changed quite a bit in recent years yet the same excuses for the same poor managers keep getting made imo. None of these players are winning a CL anytime soon but they are nowhere as bad as some of our fans like to make out, not even close to it.