As a tag wrangler, I agree with AO3 users have finally discovered the & tag, which has made gen-about-relationships way more discoverable, and opened up a new category of not-romance-but-relationship-focused fic that has always been hard to find before as even in big fandoms where the existing / tags have been around forever, we're getting & tags.

I also wonder if it's not just the young antis going "ick sex" but also the old people like me who have found their interest waning as their, uh, interest wanes. Also, I agree with those who say "but gen has always been here!" because it has.