IMHO playing youth player is a conundrum.
You want to play more academy player but you want to be title contender. You want to play more youth but you want deep senior squad.
Playing youth especially straight from academy imo is a big gamble. Maybe there are only three title winning manager that really play a lot of youth, SAF, Wenger and maybe Van Gaal
Everybody said Wenger is a perennial loser but Arsenal always promote their youth player. Iwobi,Coquelin, bellerin, wilshere,etc. They haven't challenged for title for ages but they always promote their youth.
The same thing with Van Gaal. He sold di maria,chicarito and van persie. Now Rashford,Lingard, Bruno mensah has more chance to play but they are clearly not a title contender.
SAF is the only outlier, but he is like the Godfatther of Manchester United. He can do whatever he want. Howevery, the last time he won EPL, he bought Van Persie. By doing that he sacrificed Welbeck growth.
IMO, playing youth is a gamble. You need to hire manager that trust youth but at the same time you have to be ready to be 2nd fiddle team for a while. Then if luck is on your side, they will turn into a world class player and you will dominate for a long time (Barcelona) , if not you will become 2nd fiddle team for a long time (Arsenal)