People need to understand that a topclub, needs to win games. Not just grow up infants.
Every member of the first team needs to be able to give a worthwile contribution when asked upon.
SO how do youngsters fit in ? Juventus is handeling the excellent example. Only improvement would require FIGC to change things.
A player, needs to have the potential. Each player is born with a certain potential. Just like everyone is born with certain characteristics, and how clos you get to that potential depends on mentality and enviroment.
First of all, the first 18 years are important in getting most out of that. This is the easyest part. excellent yought facillities and coaching brings everything out of them for their age, it gives em the good base.
When a player is 18, he needs to learn how sernior football goes, and how to apply those skills. He needs some tutoring and playtime. For this reason, spending the summer with the club, but beeing loaned out to a suitable club where he plays many games, preferably serie a or b(top).
Offcourse, you dont have all the youngsters in the world. co-owning promising youngsters is another way. THE most vital part after 18 is simply playtime.
WHy ? cause technical ability is allready greatly developped at 18, whilst mental ability can only be learned on the field, and later on further polished by playing with good players around.
Once a player has gotten experience, and has shown at the much lower level of play that he is good (like berardi who is blitzing sassulo), the club can see that the player has the potential to be a starter, and can add him to the first team.
He'll play less, but he's ready to play. And from here on, he can learn the style and mentality that comes with the team.
Marchisio walked such way. Berardi is hopefully gonna do that
Offcourse, sometimes, and exception occurs. Paul Pogba at 18 allready was very mature and exceptionally skilled, he could allready contribute whilst the defensive weakness was far less then other players at his age.