Its such a vile POS of a service.
Its hardly even worth my packets to type out all the ways its so bad. I feel like nobody in charge of YouTube actually even uses it for anything.
newsblur let's you organise things into subfolders too which is helpful
the other thing in going to start using is youtube-dl to download my watch later videos and then use something like emby or plex to watch them. maybe do the same with videos that I want to keep so I don't have to worry about then disappearing every second day
Movies are better served elsewhere, but there is a lot of things that you just can't find elsewhere.
But given that VLC can open a youtube link and yt-dl can grab most content, I'd love to build an app that has a proper UX.
I keep designing one in my mind - I should get around to at least proposing it to see what others think
I've seen such videos transform into [video removed] in custom playlists (which is infuriating to no end, you can't even know what the video was about to look it up somewhere else), maybe it causes videos to disappear from Watch Later entirely.