It's still a small minority of comments, but it's definitely getting a problem and just the chance — even if it's small one — of talking to a bot, rather than a human causes inhibition. Finding out that one has been talking to a bot is finding out you've been scammed. You invest time and human emotions into something for another human to read, even if it's just a quick HN comment, just to find out that it was all for nothing. It sucks the humanity out of it and thereby out of oneself. You get tricked into spending your valuable limited human social energy on soulless machines with infinite capacity of generating worthless slop instead of on other humans.