A lot of these comments feel like they don't understand how Venn Diagrams work. Yuri and wlw/sapphic/lesbian works have a lot of overlap, maybe even more than 75% overlap, but they're not the same. That's it. A work can easily be sapphic and yuri, it can also just be sapphic, or just be yuri. And genres evolve and their conventions change, they're not static so it's also likely that the definition of yuri is changing to be more exclusively sapphic content as more explicit works become more mainstream. All of these things can be true.