Has yuri ever NOT been for trannies? I've read /u/ archives going back to 2006, and even back then they were leftists, and advocated for social activism. I'm starting to think that the idea that yuri was ever "based" is a myth. Besides, before the 2010s, yuri was very niche, so it can't be argued that it was a big part of japanese culture.

So what is the actual history of yuri? Going back to the 90s and 80s how did it originate, and who was it made for?