But Sterling is the example, isn't he. Looked fine then for years then fell off a cliff. He's a shadow of the player he used to be.
As I recall, City were cautious with Foden and managed his minutes early doors, but he's dropped off too (possibly not a physical thing though).
Owen, Fowler, Giggs, even Gerrard struggled for years with what we were told were "growing pains". All of them were playing regularly at 17/18. Don't get me started on Rob Jones - fucking tragic what happened to him / his career.
Barca pumped Messi full of HGH and even then they used him sparingly when he first started out.
Saka might just be the exception, but when he finally broke last season it cost Arsenal any chance of mounting a serious challenge. I think they've been forced to play him to some extent because he's their best attacker by a country mile. Real test will be how he recovers this season, but I don't expect him to go on another 100+ game streak or whatever it was.