Not having kids is BY FAR a simpler life. I wish these articles were bucketed into life's various phases and situations. Though most suggestions still apply, there's something about the time commitment and in-your-personal-space-ness that makes simplification more difficult.
[Author of blog post here] Totally fair observation - the article I put together naively skips through some of the most complicated aspects of life. Someone that has kids, a different commute, a job that requires different effort, health-related concerns, etc. may not have an easy time at all with the approach of "simplifying" things around them. The post itself is not meant to be some sort of a universal, "you should do this and your life will be peachy" advice, but rather a reflection on what worked best for me personally, that will hopefully get people thinking about what works for them in their own stages of life.
Yeah, that's why I wouldn't have kids in this day and age. Maybe I'd do it back in the seventies when parents could say "Go play at the creek all day and be back before dinner", and you could actually have your own life, and usually only one parent worked.