Your rant about parenting is way off topic. After all, you can't "parent" if you're at work all the time.
Actually, I was reacting more to the triteness of the thread than to the OP. But it's pretty clear that the OP is imbued with much the same values. In fact, the author is making a case for them. Why else call it a "manifesto"? The thing is, the case is -- as it always is -- lined up on the side of love, nurturing, and what-really-matters-in-life. Stuff nobody could reasonably oppose. Which means that, whatever the argument is, there must be something wrong with it. If it were correct, it wouldn't exist.
For example, I can block off 3-4 hours a day for my kids where I don't work/check email/etc... That has nothing to do with how I am raising them.
The point that I took away from the original post was that taking time for your kids[1] is good for your work. It was a counter-intuitive discovery for him, but he felt that the dedicated time away from work helped to make him more productive.
[1] For him it was your kids, for you it could be your dog, your spouse, or building ships in bottles...
But in person, it wouldn't as likely come to that, because we could use many tools to calibrate - tone of voice, personal warmth, listening, etc. - and mitigate the extremes. Or we'd efficiently detect that a discussion can't get anywhere right now and save ourselves the trouble.
Anybody who figures out a technical solution to this problem is in a position to make a major contribution. Unfortunately, it may not be possible short of teleportation. We are wired for physical proximity.
p.s. For what it's worth, I have found every bit of effort toward becoming aware of this binary dynamic in oneself to pay off a thousandfold.