It depends if it's good for them. Look at Loftus-Cheek, he's wasted the last 3 years of his life until this season. Man City could play a youngster or buy someone for 50m for no risk. If I'm a manager at a big club who knows I'll get sacked if I don't win something, I know what I'd do. Man City and Chelsea can buy all the young players they want but they're really there to make them money. It's a business decision that's completely separate from the first team. If one happens to be absolutely incredible, they'll loan him out or sell him with a buy back option. Ampadu is getting a go (thank God) because for some reason, Emenalo decided to loan out or sell most of the squad players at Chelsea.