I didn't say they have no credit but you are talking about two different things here. You said there is no excitement for Fagioli because the club has not shown they can develop youth players which is not true. Then you went on to RM selling players and buying them back as some sort of proof.
If you wanna go down that route I would argue Coman, Kean, Cancelo, Pogba, Morata were all very young and raw and developed here to the point other good clubs wanted to buy them for big fees.
And there is the other side of the question - how many players that Juve did not give a chance to went on to break out elsewhere? Because that would be the only proof the club does not know how to develop players. Otherwise you can use literally any youth player who never amounted to anything and say the club did not develop them.
Yeah, you could say that. But then you could also raise the point that Juventus’ youth system doesn’t get the fundamentals right in the first place to enable those individuals to succeed. Hence, the players were never going to amount to much anyway, wherever they went. For a bit of a skewed example, it could be like mis-teaching a child multiplication in their foundational stages and then expecting them to solve modular arithmetic years later in college. Most of them would slip right through the net. I think it’s a totally valid factor that you are not considering.
I may very well be wrong since I’m not involved in the Juventus youth set up and quite oblivious to the methods they use.
But so again, I’m probably correct in assuming that nor are you involved in Juventus’ primavera, nor do you have an intricate and an in depth understanding of their methods.
So to put it lightly, I think this is classic Occam’s Razor: It’s easy to over complicate this argument, however the best and simplest proof is essentially there, or rather, not there in black and white.