I think his complaint was more about feeling forced into creating a G+ profile, not about unified sign-on. The unified sign-on should be able to work just fine

I think his complaint was more about feeling forced into creating a G+ profile, not about unified sign-on. The unified sign-on should be able to work just fine whether or not one has a G+ profile, just like it works whether or not one uses Blogger, YouTube or any other service...