If you don't have kids, this kind of lifestyle is perfectly sustainable and you can live happily on it. Kids are not a pre-requisite for happiness and it annoys me how so many discussions here start to equate standard of living and happiness to a situation where kids are involved.
You can absolutely raise children without a high salaried position, big house and tons of plastic junk. People do it all the time.
In this case the author is in an even better position - he has savings, a house, a growing business, and has managed to get his expenses down to the point where he's breaking even. That's great! Why would anyone think this lifestyle would make him ineligible for parenthood?
Some would say kids would benefit more from a parent with this lifestyle (happy, living with purpose, knows how to budget, flexible work situation that lets them be around more often) than the big house and toys that the average American developer's job gets you.
Some people don’t want children. Ever. But there’s a lot of people just like you who can’t stop talking about children in every conversation. Why?
Basically that just means we don't go out to eat that often. Kids eating grocery store food is pretty insignificant in the grand scheme of things (though I hear this changes once they get to their teenage years).
Well, it's hard to argue that it's not relevant to the discussion...
You can ask "why?" but nobody is obligated to give you an answer. Pushing hard for an answer is considered rude. You may be asking someone to tell you really painful experiences they went through.
He can live his life without the regret of not trying to venture out on his own.
Edit: typo