With your logic does a non league striker who scores every week automatically become a premier league quality striker because he scores ever week?
And as others have mentioned, the attributes are already somewhat fluid. There are things like moral, consistency etc that influence a players attributes so for example if a player isn’t consistent but has 15 for passing, he might only have that 15 for 10% of the games he plays, for the other 90% it could be a 13 or 12