I might actually use "Downloads and background play" (for which you need the higher $$$ tier) if the YouTube app gave "Skip back 15 seconds" controls on the phone lock screen. Insane to use YouTube as a "podcast" player when the only control you have is skipping to the previous/next video.
Can you use that app for any/all YouTube videos? I want to listen to long-form video interviews and such, not just listen to music and 'actual' podcasts.