I don't think Bogleheads applies for the vast majority of americans. The article in question is about a 66-year-old single mother of three, working two jobs. She's most certainly not figuring out capital gains tax.
Not only do people make little money the US government literally kicks you off food stamps if you have 2,000$ in the bank.
so yeah, you're out of touch with both the topic in the article and the audience here.
I'm gonna be the asshole here, the article clearly states she adopted 3 children. Now because it isn't a particularly good article we don't know if maybe she adopted her nieces or nephew or whatever, but probably not(based on the video).
That decision alone is a very big red flag that (coupled with the ominous "I have a live-for-now philosophy") that we are looking at a person that made some questionable decisions in her life.
By all means, if they're a major value in your life, spend your money where you choose to. But don't be surprised if that means it comes from another part.
That said, at some point demographics are going to result in a need to incentivize child rearing politically, particularly in developed countries. It may be wise to look to how difficult this process is going in China and Japan and get out ahead of it before it is the emergency it's growing into over there. We may take an ever present labor pool for granted thanks to immigration over our Southern border here in the US, but not every job can be filled by a migrant worker with little formal education.