I have no issues with Max not playing the younger players if they are not showing that they are deserving of such during training.
You just don't throw youth out there for the sake of it. They have to earn it, as you can't give these kids a sense of entitlement.
Now, the only issue that I WOULD have is if they were performing in training, but Max chose not to start them because of their youth. That would be wrong to do so, but since none of us are there, we can only assume that playing time is earned through outshining others in training. A meritocracy, the way it should be.
I think a lot of Juve fans were spoiled by what Pogba has been able to accomplish in such a short amount of time, and assuming that any youth product from an established club that Juve have pried away will be the next Paul, which is almost impossible. Pogba was the exception to end all exceptions. You simply don't procure world class talent like that from under someone's nose. I honestly can't even recall the last time that has happened. The fuckup of all fuckups if you are Manchester United.
Granted, Coman has shown ability when he has been given the opportunity, but Juve are not a club that needs to throw this kid into the fire. They have enough quality to where they can take their time with him. He doesn't turn 19 until June.
And this is coming from someone who was screaming for a housecleaning and a youth movement when Juve got relegated, so my stance on developing young talent is not new to anyone who has been around here for a while.