Earlier quoted context omitted.
This is all post-facto rationalization to avoid a more glaring truth. Women aren’t having kids - because they can avoid having kids. While still having sex and having societal benefits, including retirement. That is a very, very new and unusual situation when looking at the span of human history. Birth control is a pretty new invention (mid 60’s approximately), and societies globally have been steadily rolling it out…
You're looking at the trees but missing the forest. Birth control is available in countries where women are having over 5 kids on average each despite that. Similarly, legalisation or the illegality of abortion has no significant effect on child birth rates. Availability of birth control (or abortion) alone doesn't explain the "big picture", it just alters it a little bit. These are Catholic and conservative talking…
Previously, women (unless celibate or okay having abortions a lot) had no choice but to spend time at home, which forced the market in that direction.
And I’m also not confused about birth control availability. You’re confusing ‘theoretically available’ vs ‘socially acceptable available’, which those societies haven’t hit yet. Ideologically, they’re very resistant - but changing.
Just like the changes in the US (starting to be possible in the 60’s) didn’t become the norm until the 80’s to 90’s or later. American Catholics have been okay with birth control since then (roughly), where South American Catholics are still against it.
Which, notably, is when the US started to become more heavily two-income household dependent. And when wages stopped keeping up with growth.
Without birth control being possible, none of it matters - which is why it being possible is actually important. And why we’ve been seeing steady change in societies since it has become possible.