Subscribing to channels. Trim silences. Various pitch and speed options. Background play. Picture in picture. Watch history. Playlists. NewPipe also plays Soundcloud, Bandcamp, and has the entire media.ccc.de library and can do all those things with those services as well.
Don't you have to be logged in to get all of those features? For obvious reasons I didn't even consider that to be a option, as the goal is to put as many barriers between Google servers and yourself as possible.
One of my most used F-Droid apps.