For avatars to have any functionality in the real world and for the technology to truly be adapted there has to be realism beyond the uncanny valley. You cannot implement a really fast model that accomplishes tasks if you don't have a great sense of depth, emotion, and detail. Speed and functionality is very important but the core problem lies in people not wanting to use a C-grade model which doesn't have any realism. Over the past 2-3 years Nerf training speed has gone down from a few days to just a few minutes with Instant-NGP so the functionality is improving.