I totally agree with what you said. And these were initially my thoughts but I fiddled with them a bit. Medicine is surely sustaining our reproduction rates despite its diverse implications on the gene pool. But how will this affect us when this medicine and healthcare are unavailable? Many globalized and consumerist third world countries are unstable and when they fall into turmoil those services like healthcare, imported foods, infrastructure become unavailable or at least limited. Admittedly, you can shift this into a matter of global inequality and historical oppression. But what the cases of global collapse? We could hypothetically regress maybe decades if not centuries due to either human or natural causes. We may at least have a fallback which is our genetic construct. But it’s difficult to maintain it when most of us embrace a sedentary lifestyle that inhibit our useful instincts.

I found those links interesting https://www.extremetech.com/extreme/186805-the-solar-storm-of-2012-that-almost-sent-us-back-to-a-post-apocalyptic-stone-age

https://web.archive.org/web/20220826025716/https://www.nasa.gov/mission_pages/sunearth/news/flare-impacts.html