They broke Youtube Comments

I can not figure out how to comment on youtube videos.

I mean I can comment to the video, but how do you reply to the existing comments?
Some of them don’t even have a reply option.

Don’t they know that’s what people like about Youtube? Telling people off, or complimenting them.
It looks like they are forcing everyone to get a Google plus account and add every single person, otherwise, no one can get a much needed message out.
Looks like they are dooming themselves to fail like G+.

Google seriously does not understand what social networking is.

If people do not like Google Plus, forcing them to make a Google plus account to use your existing service, is going to bring you less people to your existing service. It will not bring you a magical more, you’re just reusing the same people that stick around after getting frustrated.

Should market G+ elsewhere. Not in your money maker. Or offer the old way along with Google plus, and just give fancy features to the people who use google plus to comment with