https://www.transfermarkt.com/juven.../0/galerie/0?wettbewerb_id=IT1&option=0&art=0
just look at this list. players from juve academy, with more than 50 serie a appearances, born after 1990: kean, rogerio, léris, audero, lirola, romagna, mattiello, rugani, spinazzola, chibsah, büchel, immobile, falque, lapadula, marrone.
former juve academy players with a current market value over 10m: immobile, spina, kean
but of course we can discuss how many talented players' careers were destroyed by allegri