The non-customized (viewed in incognito) main page of Youtube that is the recommendation for the average viewer is even worse, nobody should ever touch that horror show.
Youtube is a horrific service. The recommendations are terrible, the UX sucks, too many ads, they dont know how to use the sreen real-estate.
I freaking hate youtube.
WRT to real-estate, I see that the video I am wanting is taking up ~20% of the screen, then there is a list of completely unrelated content, and I have to click to see the date of the submitted video.
The UX is different on every single device. Phone, machine, ipad, browsers differ... its just a mess.
This would help me to quickly sort out if I would consider watching something and I could reduce my watching list to the things I'm actually currently watching instead of abusing it for "might watch at some point".
If I have watched something I don't want it to be recommended to be and if I don't like something I don't want to see it again.
This is a standard ML practice, otherwise ad networks would be stuck showing you the same ads (even though it feels that way sometimes). I'm willing to wager large sums of money that Netflix has tested EVERY idea mentioned anywhere in this thread and many others you couldn't guess.
However, I've also gone back to Netflix DVD. They have such a massive catalogue of movies and it seems easier to just skim through genres and find weird gems.