Please just give us the ability to blacklist channels. That’d increase usability by 10x for me.
AFAIK you can do that? Hit the menu on a video recommendation, "Not Interested" -> "Tell Us Why" -> "I'm not interested in this channel". IMO, though, blacklisting has been mostly proven to be insufficient. If you block, say, noted chud Sargon of Akkad, that doesn't mean that another half-dozen "Rationalist" "Thinkers" Who Just Happen To Be Chuds won't be recommended to you as well.
I did just that, clicked on "not interested" -> "tell us why" -> Not interested in this channel"
Yet I'm still getting video suggestions from "Charisma on Demand" and the like.
Also this mechanism doesn't account for changing tastes.
I was one interested in a certain gun channel, but after a shooting and particularly deft comments about it by channel owner, I decided to take up interest in literally anything else. Yet the videos from it and the like followed me around for about a year.