>>279993014
ironically, a lot of the issues with udon and things that hold up the 2018.4 LTS release isn't vrchat, it's bugs in unity. 
VRChat's team does get support directly from Unity, they are a professional dev house, and since vrchat is essentially "play with unity scenes in a sandbox", and having access to thousands of creator assets of every configuration under the sun, they tend to find bugs and issues a lot more than other people just making a game. 
VRChat is actually contributing to the development and stability of unity itself, in a way.