The other thing I've noticed is that the separation and challenge of raising children has made me more productive. You don't know stress until you've had a newborn. There are things at work that used to affect me and I look back now and think "how was that even a problem?"

If I "ambitiously worked on side projects", I'd at best miss times I'll never get back and at worse be downright neglectful.

That's a "trade off" I haven't thought twice about making. There is no mistake. As I said, my kids are number one.

In fact, I'd argue it isn't much of a trade off at all. Time with my kids is infinitely more valuable than time spent on my career.

Someday :)

I believe that having children gave me more motivation and reason to be better at the things I do. It also forced me to structure my life a lot more which can have beneficial effects on productivity too.

You cannot know the feeling of it until you do. You cannot really understand it until you do. It changes your world.