I can't even comment.
Google, stop fixing things that do not need to be fixed.
This wasn't them fixing anything.
They were tired of people not switching to Google+, and they made so many new users use Google+ that they could claim the majority was Google+ and they were justified in closing out all old accounts from commenting. You need to make your account Google+ to interact with comments beyond viewing now. Not only that, Google+'s stuffty comments are bare-bones and filled with useless stuffty features. AKA most of the features of the old comment system didn't transfer over because they started from scratch adding what THEY wanted. Now it's extremely incompatible, buggy with old comments, half the quick-fixes they did don't work right. Beyond that, as others have reported, the site has started giving major errors. Haven't seen those in years. Everything is breaking REALLY badly.