I'm so sick of trying to get the YouTube app to work for my needs. It is almost comically bad with suggestions, recommending something I watched literally 10 minutes before or stuff that is completely unrelated to what I'm watching (like yes I looked up a recipe one time, I don't want to watch that all the time now!) Plus the UI is not built for playlists at all. If you want to scroll through a Playlist, it always starts at the beginning. If you want to search, it takes you out of the video.
I use Kodi with the YouTube music addon. Great search options for artists, charts and playlists which can be saved as "favorite" in another addon called "auto widget ".