They're completely different concepts though. One is "I don't want these people to be able to see this". The other is "I want to publish this at people who are interested".
When I publish a post via my +blog, and it's about my piece of software, I want to publish it to my project followers, but I don't necessarily want to target it at my family. Does that mean I want to hide it from my family? Not necessarily.
When I publish a post via my +blog, and it's about my piece of software, I want to publish it to my project followers, but I don't necessarily want to target it at my family. Does that mean I want to hide it from my family? Not necessarily.