Well, that's just statistics. If there's ten times as much het being made which is twice as likely to be picked up by a site like nhentai, then muscular women in yuri need to be twenty times as prevalent just to reach parity with muscular women in het. Whatever the real numbers are, they're probably less favorable than that. At some point you end up needing a double-digit percent of yuri to have muscular women to reach parity, which...I mean. I get someone's salivating right now, and I respect that, but yuri as a genre is too varied for that to happen.
Oh no, obviously I know there is more het than yuri. My reasoning is, if you have 1000 het 100 have muscular women, if you have 100 yuri 10 have mucular women but yuri still only has 3 with them. I think it’s not popular with fans of the genre (not that in het it’s super popular either, but definitely more consistent). I added nhentai but I mostly use pixiv as a “source” because you can post whatever there (not-commercial stuff so no need to meet standards) and so that people can see your art, artists use tags, so you see almost all the content of that topic that may be on the site.
I am sure Gram love awakened thanks to SU, and now they draw OC where both women are muscular. When I had twitter I looked through their followed list but didn’t find much muscle x muscle, but almost all artist that draw muscular women followed sono haha