OP, I find the attitude quite strange. Why worry about other people's choices if one is happy with one's own?
I have been both a SAHM and a WOHM. I quite liked being a SAHM and did it for over a decade, having left a "serious" career. For us, it worked for us because
- my husband and I were in agreement about this "strategy" for our family and committed to each other. All money is ours, not his and mine.
- my husband earned enough to support our family on his own and still save for a rainy day, etc.
- we live in a pleasant area where there were plenty of opportunities for me to find purpose and stimulation without needing to be in a "job"
This was great for our children at the time because they liked being picked up at 3:15 when they were little to tell me about their days, help prepare dinner, read to me, etc.
Now I work outside the home. I enjoy what I am doing, and as they become older the extra money becomes more important. Now I get home at 6:30, our meals are less from "scratch," they weekends are full of chores, and I wish my youngest didn't have to go to breakfast club, but that is how it is.
I feel happy that I was able to be there all the time for them when they were tiny. I wish it was an option for more families to have a SAHP during the primary years because in my experience it was a nice way to live. A little slower and less stressed.
I don't judge anyone though. There are lots of reasons to go out to work, all valid and none are for me to judge.