The main advantage of using YouTube with an account, is being able to see what's new from all your subscriptions.
To get rid of the annoying stuff, I added this to my uBlock Origin filters:
www.youtube.com###comments
www.youtube.com###related
www.youtube.com##.ytp-show-tiles.videowall-endscreen.ytp-player-content.html5-endscreen
This of course also eliminates ads.