How badly Mozilla messed up with Firefox on Android is worth another topic, however.
[0] https://addons.mozilla.org/it/android/addon/video-background...
Background playback is a paid feature. You may disagree with that decision but the option is there if you wanted it.
These are all solved by Vanced. Paying for Youtube premium does not solve any of these.
No background play
Mainly
I can modify my behaviour instead. Watch using computers with Adblock and de program myself to want to listen to music from YouTube.
Boom done, no need for a YouTube subscription. Subscription hell has got to end.
All of those above are possible via the website - it remembers your video's quality and speed preferences.
There are too many youtube stories shoved right in your face with the app - no way to disable it.
There is no way to disable the 'cast' button from the player - it's not very useful but you can easily fat finger it.
That's just the surface - i haven't even gotten to the ads, and the forced community posts etc.