It's incredible how lightly they have thrown away the Google+ Account For Everything stance given how merciless they were in imposing it at the time. The wails from YouTube in particular have only just died down. Kudos to them, but a lot of pain could have been avoided if they did all this listening back then, instead of waiting until their thing was clearly dead.
This isn't past-tense yet. Until this change, which isn't fully deployed yet (http://youtube-global.blogspot.com/2015/07/youtube-comments.... , "in the coming weeks"), YouTube still requires a G+ account to comment or upload videos.