I bought and used to use Tube G Pro to access my playlists, make playlists, and watch videos in the app’s resizeable pop-out window, but it stopped properly working for me a couple of years ago and the dev was totally unresponsive.
I manually negotiate Youtube’s subscriptions, playlists, etc in Brave (with an extension that customizes the look and keeps out ads), and I often download videos from Youtube that I want to review/save (or which I believe will soon be pulled for copyright reasons). I have a couple of apps that do this, but my favorite is Softorino Youtube Converter, which among other things can also with a click pull the audio and put it into my iTunes song library (or download and/or convert videos and put them anywhere, including iTunes). It’s smart enough that as an app in the background it can recognize any Youtube/Vimeo/Instagram/Facebook URLs from the clipboard and put it in a queue in case I want to download.
