Playing youth is one thing but cultivating an environment where they can thrive so it's in the DNA of the club is another.
Too many managers it seems think it's a simple as throwing youth into the side and that's it, job done, they're only ticking the box and appeasing the fans short term.
Last manager where you felt there was some sort of plan was perhaps Puel. Everyone else since has either been sidetracked by pressure of results or just wouldn't have a clue on how to cultivate that environment.
Sadly Rowett seems to fall under the latter.