This is cool! Not entirely sure whether I think it's a good idea, but I wonder if it'd be useful to come up with a way to tranche websites.

Some sites are complete garbage and should be blocked, for course. Others (e.g., in my experience, Quora) are sometimes quite good and sometimes quite bad. Wouldn't be my first choice, but I've found them useful at times.

For a given search, maybe you try with the most aggressive blocking / filtering. If you fail to find what you're looking for, maybe soften the restriction a bit.

Maybe this is overwrought...