I'll buy the argument, because as a teacher you see batshit crazy....parents. Sometimes kids fail. It's not important that they do, it's important that they get back up and learn from it.
I have many wonderings about my childhood, but one of the things that my father did exceptionally well was to provide me a coaching model of parenting. He wanted me to fail in school and be overwhelmed. Unfortunately, I'm a badass and could handle almost everything that was thrown my way. But, he knew that character stemmed from doubling down, gritting your teeth, and getting shit done.
Reflecting on that now while looking at many of my generation, I find that we are really soft. Living with people I'm surprised by the bubbles that parents continue to provide for children. Don't get me wrong, I love my parents...but I'm my own person now. I didn't accept money for a new computer because I got robbed (I accepted it as a Christmas present), because I was able to be a grown-up. An adult. (and to be overly gendered) A man.
In my classroom, I remember that we always celebrated our triumphs over our failures. We fell down (myself included) all the damn time. But, we got up and kicked ass. I miss teaching little ones and getting to celebrate those victories and instill those early character skills.
Also, the book is pretty legit. There's a random chapter on chess that seems slightly misplaced, but I valued the overall narrative that was crafted. And, I'd love it if parents didn't helicopter as much.
Also, I can bench 215 now and have lost about 20 lbs. I can also do 30 push-ups continuously and 8 pull ups. BUM BUM BUM.