Wasn't as harsh as the headline, firstly.
I agree with his conclusion 100%, but meh on his reasoning. No one cares if that's how most of us were raised. Obviously, most of us didn't even have the internet or cell phones. Wish it'd just be about "because that's how we best develop young people for what they need" instead of "this is how my parents or coach in the 80s did it."
But, whatever. If Mario sets expectations, and the player or parents don't like X and don't want to address X conflict directly, I think whoever doesn't like it can GTFO. Coach, player, anyone. That's just good leadership.
Whether it works or not (and I think developing these skills in young people works!), not sure how anyone can fault him for the attempt to develop humans while he presumably develops them as football players. Ideally, we'll attract more players/families who want to be part of an environment of development.
By all means, everyone who isn't on board walk the fug out! The sooner, the better. It'll get us a relevant result sooner. This includes Gattis, but that's just my opinion. ha.