Karma scores are not front-and-center, though. Years ago, they switched to hide the score of an individual piece of content (such that an unvoted content is visually the same as one that has 100 upvotes [it might be sorted differently, but otherwise is indistinguishable]). To my mind, that was one of the better changes to the quality of community moderation.
Agreed. And HN has something I associate with it specifically: the back-and-forth argument, maintaining consistency in positions and reasoning, looking like two people taking. But, upon inspection, many people are involved. That, I think, is an example of the de-emphasis on identity.