I’ll also add. Its far far from an old fashioned idea. The very possibility for people to avoid children is an extreamly modern one. Pre the 1960s it was impossible. And morally shunned for married couples to avoid children. And the idea that birth control was widely effective and available. Did not really hit until the 1980s.
Heck even as recent as the 2000 doctors failed to warn patients on birth control of medicines that can cause it to fail.
Not to mention the many many health reasons (for women) why some couples still need to choose less effective methods.
The only truly effective method with limited health. Involves males choosing a permanent solution. (Yes it is permanent. You have a max of 10 years for reversal. And even then odds are far from 100%. )
Hell of a choice to ask a young couple to make. If they are to poor to have children now.