Not every user of Quora or Slashdot post trash, but the signal to noise ratio is high enough I don't use either of those sites. Yes it means I undoubtedly miss

Not every user of Quora or Slashdot post trash, but the signal to noise ratio is high enough I don't use either of those sites. Yes it means I undoubtedly miss out on some really informative content, but it's not worth the work of sifting through the trash to find it. I don't have a Twitter account, but it seems very reasonable that for some people blue checkmark could have the same problem, blocking them all might mean missing out on some good content, but not enough to make it worth shifting through the garbage, especially since Twitter will happily promote any paying user's post. If someone has to block hundreds of people to let the good one or two through, it probably makes more sense to just give up on the few good ones or make exceptions for them.