Here's how bad it can get. As an experiment and example to GAG, I posted a question while requiring only private opinions. And as soon as I had the minimum required opinions, I selected MHOs to force the question closed. This is the result.
I don't do anonymous or private... what I have to say or ask will be asked and said publicly. No question is stupid and an opinion isn't a fact. Plus I rarely get embarrassed so this private feature and those irrelevant notifications going off every 2minutes are beyond pointless. That's why they invited the direct messager lol
It's actually amusing that private opinions can be seen on the users profile page; however I've never answered an opinion privately (it's stupid because it defeats the whole purpose of this site - I don't get why that was implemented)
But if you were to know my username (and perhaps you do, as I don't care) you were also to see all the questions I've answered anonymously (!)