Earlier quoted context omitted.
This is a real thought process people are contending with. There's also just the simple fact that kids are liabilities more so than assets. That's not been the case through most of human civilization. I wouldn't limit it to economics either. Socially children are restricting. If you want to be free to travel, move, leave the house on a whim, etc. then kids will interrupt your plans/logistics.
I hate to break it to you but those are almost all economic problems in the grand scheme of things.
Likewise, sure things like nannies can be hired to increase my flexibility. But, there’s a noneconomic factor of me just not wanting my kids to be raised by nannies. This requires my presence and engagement.
These are part of a noneconomic value system. In fact, many values like these are at odds with economics. Parents choose to place their values over economics. This might look like passing on a job/promotion that would require a relocation. If you are self aware enough to realize you have these values, you can estimate how becoming a parent will impact your life and choose how important creating a family is to you and if you want to ensure the consequences.