I appreciate improvements in SL graphics as much as anyone... but one would have to question the added load of PBR when for YEARS avatar rezzing has resulted in orange clouds that sometimes never disappear (directly traceable to textures failing to load)... and similarly 2D textures taking 30, 60 or more seconds to load into the viewers.
Get the 2D basics fixed before adding huge modifications. Work before toys. Base functionality before shiny. I am getting VERY tired of going to events like FANTASY FAIRE and seeing nothing but orange clouds all over the place. Frankly, I preferred the days of the default texture. At least we could tell the basic shape of what was there.
We need avatars to rez. We need textures to rez. PBR is nice... but basic texture loading would be nicer.