So in later updates, VRC will be in Unity 6 update,
In Creator Companion, the Unity 6 World and Avis are added as recommended.
So moving on to some new Features in VRChat like:
Enstars-like UI menus = Main Menu 3.0ES & Quick Menu 2.5ES
Compatible with older VRC avis that have Unity 2022 or 2019
Udon updates
Qof changes
Camera updates
etc.