Remembered recently that I have this really neat little app called "Play" for queueing up and watching YouTube vids.
https://apps.apple.com/gb/app/play-save-videos-watch-later/id1596506190
Works on iPhone and Mac and syncs with iCloud.
Share videos from YouTube using the share sheet on mobile. Curate a watch-later list from there.
Watch picture-in-picture on iOS! 🙌
Escape the algorithm and curate your own watch list.