I eventually became somewhat youtube-dependent for media consumption, but I don't quite like the natural flow of youtube's algorithms' "play next" suggestions, which are probably even minimally bearable when I'm logged in.
So it can be interesting to have a shuffle of a series of chosen playlists to be played when we're doing whatever. The arguably best-ish way for doing it is to save YT playlists (the list of URLs, not the video files themselves) on disk, then do some bash/sed...