One thing that's been pretty annoying is the triangles, and since the Unity 2022 upgrade some lower-end systems no longer are able to run due to hardware support, eliminating the need to worry about someone running VR on like, a GTX 780TI. There should be a grading system for polygons, somewhere along the lines of the following:
• Excellent: the existing 32,000 Tris or fewer.
• Good: 32,001-70,000 Tris, where the existing system gets it's pass/fail nature presently.
• Medium: 70,000-110,000 Tris, this is where most avatars tend to be, and there's no observable difference between 70k and 100k in most instances.
• Poor: 110,000-150,000 Tris, this avatar could use some work but it's not that bad.
• Very Poor: 150,000 Tris or more, this is getting a bit excessive and the avatar should be optimized. Reduce topology or remove meshes that are not in use.