Love your thoughts on the matter. Already mentioned my SL/OS rig in a comment below. I don't mind the move to using PBR and 2k textures but as I said below, the move to Vulkan should have happened first! It is true that PBR isn't a new development for advancing texture graphics. Many games have used it for some time now, including the DOOM reboot from 2016, which uses Vulkan (along with Open GL 4.5).
In any case I don't think the end is near for either SL or OS. I just think the OS community has to be careful in vetting things like PBR. The overall experience counts first, and I feel that there really is more diversity of thought and creation in OS vs SL. That's what attracted me to come here after a year of being in SL. I love both communities, but find OS to be a lot more fun to be in. For whatever reason, even though there are fewer folks in OS, I actually manage to talk in world more often in OS. Right now my unscientific split for time spent between both is... umm... maybe 65% OS and 45% SL.
You mentioned Active Worlds... hehe... I also have an account there and yes, the graphics are ancient but some of the sims there are fun to mess with. The so-called x rated sims are my favorite, they're rather comical but I get a good laugh out of them!
As far as other older metaverses... the Cybertown crew is also active... they do chat a lot on DIscord and I have tried it a few times, worth a look for what is possibly one of the first metaverses to run from a web browser (definitely even more dated vs AW3D though).
like(3)