Many game worlds use tracking of player's head positions to put important indicators or gameplay features, and many people don't realize that their avatars are preventing other people from playing the game properly.

This is because to the local player, everything functions correctly. The udon call for 'get local player>tracking position>Head' tracks the actual head tracking of the player.

But on other clients, head tracking is based on the avatar.

It's a prevalent enough issue that I've had to start adding skeletons to avatars that don't use humanoid animations just so my avatars don't break the game experience for other players, but most people don't realize that this is an issue.

A good way to test this is to go into a game like freeze tag, where above each player is supposed to be an indicator of what team you're on. However, if your avatar lacks a humanoid rig (visible or not), the indicator will be stuck at the position 0,0,0 for anyone else's client.