I'm going to swoop in here and point out that the extremely angry shader arguments are poisoning the well tier and muddying what should be a pretty easy conversation.
I don't really care what your favorite shader is or whatever, I'm just asking people to have good hygiene and have a decently optimized avatar ready to use when the instance gets really big. Like 40-80 people.
Last night at the bunny suit picture a lot of people showed up which is nice but pretty much everyone crashed out or had to leave after the pic, even those with high end PCs, because it was so laggy and people make zero effort to have optimized avatars these days.

I think it's fine to have your showy unoptimized avatars when it's a small group, but it's kinda annoying when people roll in with their 70 unmerged meshes, 3000 dynamic bone interactions, and 400mb filesize and the meetup is big. There's no computer that can keep up with that when there are 60 people in the world and 40 of them are ridiculously unoptimized. 
If people need help learning to optimize there are lots of people who are talented with avatars around that can help.