>>417766423
The CC is basically mandatory for Udonsharp worlds because they only distribute it through there now. I'm sure you can setup your package manager manually for it but no one has made a guide for that yet.
For avatars or for existing world projects, you don't quite need it yet. It's still full of bugs and lacks usability. For instance, it will start your Unity project with the wrong version of Unity until you delete all other versions or manually adjust it somewhere in the config files.