pg seems to have more of a problem with the "quality" of comments than many users who actually enjoy the use of deep threads for conversation. I understand pg's point of view that that is just noise to him, but to those speaking constructively it is the conversation they want. If this was a move to cut down on trolls I would understand. The question to ask is what is HN really for? Is it for the users to converse/think freely or for the site creator to wrangle/curate smart comments. It seems the later is more in tune with HN's mission as a business, and alas the direction it's heading.