The most beautiful and successful period of the Farca is with the Masia players, like 92'class of United. The goal is not to have 11 former players at the club, but a mix must be necessary to complete a group. If we had a good Academy, what is the point of paying Danilo 30 million + 4 million salary in view of his mediocrity, a young player would do just as well ?
The problem is the Academy system in Italy is a disaster (we have a U23 team and we recruit loser players who are over 30, what interest ?) and conservative mentalities too.
Lyon producted Benzema, Lacazette, Umtiti, Fekir, Aouar, Tolisso, Martial, Cherki... but financially it is not possible to keep them, if Juve invested seriously to improve its academy and its detection of young players, with its financial power and its appeal, it would have no trouble keeping an entire generation of great players. Marchisio is the only example, but unfortunately far too rare.