Just wondering because it doesn't make much sense to me. People can still message you. I would hope you're not putting personal info in them i. e. full name, address, etc. When you can be whom ever you want online why even bother setting it to private? Am I missing something? What's the point?
I think they do not want users stalking the questions they answer and such. Sure, they can still be messaged, but those can be ignored. Having every question they ask, opinion they share, and myTake they post creeped on potentially can be unnerving.