Something I've been thinking for years is that Youtube should have a "ban this channel from my sight" option.
The "never recommend this channel to me" feature is so weak. I mean, you can't even use it unless you find it in your recommendations.
I want to go to a channel's page, and select "I never want to see anything from this channel ever". Complete banishment.
Yeah, it's annoying that I have to use a browser extension to add in this feature that most other sites have by default. Some channels put out content that I'm not only "not interested" in, but that I actively want to avoid.