The author seems self-aware and I think there's a lot of good observations in this post.
At the same time, I think ambition needs to be paired with humility and acceptance of you can't have it all.
There's no perfect life. You can't optimize everything such that you achieve a hypothesized balance between all the things that are competing for your time and energy. In the final analysis, most people, if given the chance to reflect before they die, would choose more time with the people they care about than more time working, even if, in the moment, they felt they were doing a good job balancing the two.
Kids are also not always a joy. I love my kids, and there were certainly moments of joy, mostly when they were young. As they grow up, they turn out to be their own people. They may ignore your advice and learn life lessons the hard way. They may not live up to the hopes you had for them. Be prepared for some disappointment. Doesn't mean that you don't love them, but they can be frustrating.
To be fair, I'm sure I disappointed my parents in some ways or times also.
I think this is the point though right? The author is saying that he rejects this dichotomy and he's attempting to take on both even if others might perceive it as impossible.