Knowing the Photon ID of an UdonBehaviour would allow us to troubleshoot sync between Quest and PC by providing ingame UI displaying the ID of certain scripts.
Non-matching Photon IDs is one of the most painful issues when maintaining Quest support, especially since some Quest worlds rely on a different project/hierarchy which can bring Photon IDs out of sync. Networking doesn't work and it's really hard to debug or find out why.