@Xaelath
Uh... yes? Yes it is bullshit. Who are "they"? Are you talking about Mangadex? Not exactly the best people to look at for guidance on what tags make sense.
Instead of stupidly pretending that Shoujo Ai exists or that Yuri only focuses on one specific part of lesbian relationships, these pirating scanlation and anime sites should get with the times and finally clean up their tags. But they won't, because these small internet communities are worse than grandparents who were raised with a certain bad belief. They don't wanna go through the trouble of re-educating those who thought 10 years ago that Shoujo Ai is an actual thing. They don't want to put in the effort to remove the stigma from Yuri (which only exists in the West and only by people who are too surface on the genre to even get it). The actual official licensing and publishing companies out there who
sell Yuri manga call the genre Yuri and GL now. Just like Japan always did. To cater to a couple of uninformed relics is exactly what makes these sites so frustrating.
If the Shoujo Ai tag was deleted today and all stories that had it now sported a Yuri/GL tag, how much time would it take for people to adjust? A month at best. It doesn't take a genius to connect the dots. If there is no Shoujo Ai tag, people will come to the obvious conclusion that it never had any purpose. You don't get a warning in het romance whether there will be "sexual content" beyond the Ecchi and NSFW tags. Why would Yuri be any different?