We on kbin have not developed a knee-jerk "downvote everything I disagree with" behaviour that reddit had and lemmy.world is starting to have.
I think this is because we can see each other's downvotes and so we use them more responsibly. People from other instances don't have that so they behave differently.
Downvote-to-disagree has an offputting effect on discussion and creates echo chambers.
Not federating downvotes from much bigger instances allows us to develop our own culture here on kbin without it being buried in an avalanche from elsewhere.
Brigading from places like hexbear doesn't really affect us.
I'd prefer that kbin communities continue to develop based on the ethos of the people here, rather than potentially having our upvotes cancelled out by downvotes from a larger instance.