Hi Bungie,
In Menu > Roster > Fireteam Privacy, the game does not save my preference for Invite Only. It always reverts back to Friends Only whenever I restart the game.
If you made it this way on purpose to encourage socialization, it's having the opposite effect for me. I'm a pretty private person, and I cherish my alone time. I still have friends I've made in Destiny, but I need to be able to control when and if they join me.
I have a few people in my friends list who always join me whenever I forget to change my preference to Invite Only. This only makes me resent them more, and consider unfriending them and becoming a hermit. I don't necessarily want that, I'd just like to be the gatekeeper of my own social game experience. I hope you understand.
If it wasn't on purpose, sorry. I know you get a lot of Community feedback and it's hard to address all of it.
I still really like playing Destiny.