Why switching/reverse couples are so rare?

So the question is: why switching/reverse couples are so unpopular in BL world. I know, I know some people are going to accuse me that it’s not true and name the same 20+ titles everyone has reread already at least few times. But what are 30 stories in the ocean of thousands? A drop in the bucket. I can’t name any news switching couples stories in the last year or two only continuations like “Happy shitty life”, “Neko x neko” or “Thirst”.
What’s more a lot of stories on the site are wrongly tagged and under „switching” or „reverse couples” tags you can find stories with the same overused trope how one guy used to be a total top but turned into total bottom in his new relationship, of course a lot of the time such stories are full of SA but that’s beyond the topic.
I know I’m going to get accused that stories are more than sex and it’s not that important but I find the extreme underrepresentation of verse gay/bi men very questionable in BL world.
Few years ago I believed we are finally getting more variety in BL world, especially after appearance of “Dark Heaven” but beside a little bit more of buffy bottoms titles (who a lot of the time act like the most stereotypical “ukeish ukes” but I don’t even want to start the whole discussion about homophobic uke and seme archetypes), BL world is still heavily heteronormative and even the plots feel super repetitive and uninteresting these days…
So any ideas? I’d love to hear your thoughts on the topic.