What I mean by that is that, with the recently added localization translation of the quick menu tooltips, having the set language of the player accessible with Udon could be nice to create:
A way to automatically translate the world to the right language on player join.
For some worlds, have a simple list of players by name.. and later on maybe even do a graph by spoken language in the far future (need string upload for that yesyes)
and I'm sure creators will find more interesting ways of using this.