Hello!
I've known about this component for a while but never realized how useful it could be for world creators until a few hours ago.
This component is already built into Unity and actively supported, there is no other download necessary and it can be used to get the transform of the head position, eyes position or hand positions as easily as just putting the script on there and changing two boxes.
I want to emphasize that it allows tracking of HANDS, expanding the number of possibilities for world creators tenfold.
This would be a much easier and reliable way to track the player than resorting to the current VRC UI component and scaling a canvas.