“Hide comments in downvoted threads” is now active

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.