>>372100645
>>372099723
Depends. It's better to keep at least the face(usually named body) separate since it'll have a lot of blendshapes, but if you're going for an excellent rating, everything needs to be one mesh.
Check the rating system so you can build to target while keeping in mind "excellent" doesn't always mean optimized.
https://docs.vrchat.com/docs/avatar-performance-ranking-system