Yeah that's what transfers generally aim to do. Having a clear system with players having roles within that system will mean that you'll always be looking at who, what and where can protect or resolve weaknesses in your team and you kind of hope they raise the overall level of team, which wouldn't just be one player and their individual stats.
Striker struggling with lack of chances? You buy a creative midfielder
Creative player not registering many assists? May be that you buy a striker with the skill set take advantage of their main method of creating.
This wasn't unique to Pogba and its not strange that Maguire may benefit from a certain system and playing with players that protect his weaknesses. Teams do this all the time. Getting the best out of your players is bread and butter stuff.