FWIW, it's much better to downrank a page than to outright block it. Blocking is for a page you never, ever want to see.
I personally dislike Pinterest and TikTok, but sometimes it might be the only source of an image or video. Blocking means you don't get to see that result.
Most of the time I agree with you, and prefer downranking, but I have to take issue with your example of Pinterest, because my experience with Pinterest is that if I'm searching for a specific image, I will always get a thumbnail of exactly what I want from Pinterest, but when I click on it, I'm taken to a page of completely unrelated results. It is beyond frustrating, and specifically blocking Pinterest was one of the primary features that sold me on Kagi.
I personally dislike Pinterest and TikTok, but sometimes it might be the only source of an image or video. Blocking means you don't get to see that result.