I just found out that a new website feature was implemented 2 days ago. If a comment is voted to -4 or below, it and all replies and downstream comments from it will be hidden from Recent Comments, and further replies in that subthread will incur 5 karma points penalty. The hiding, but not karma penalty, applies retroactively to comments in that subthread posted before the -4 vote.
This seems to be worth a discussion post since most people are probably still voting things to below -3 without knowing the new consequences of doing so.
Yes, and I like it (a lot). Especially now that the comments are hidden. When the comments were still visible it was more necessary to reply (so that errors aren't accepted without correction). Now the (presumably, more often than not) bad replies don't require high-quality refutation because they are invisible to those who don't seek them out. The penalty to comment replies has very little downside.