a quick shortcut flow in a browser on the youtube channel page (a click below the video title):

ctrl+u ctrl+f "rss+x" -> shows a click+copyable video.xml link

I understand people being pleased to learn this, for me the peertube announcement was learning about p2, as it's been around a few years already.

alternateEnclosure is a real gem in the p2 rss spec, the thing that makes multiple channels and alternative formats/codecs/resolutions work.