There's value in making private only and anything you post is seen by followers the default case. Mostly when marketing: if I don't ever want to publish publicly a landing page that says this:

> Haven is about sharing privately with friends and family. There is no option to make your blog public to the world. You get to create an account for anyone you want to have access.

Is more compelling than one where grandparents have to register, find my blog, I have to approve them, and for every post I have to set permissions levels.