What I don't think many people understand (and I get it, as homebirth isn't that "common" in our culture) is that one of the main reasons many women choose homebirth, is to birth on their own terms!
I realize some women love having the room full of people. I've watched many video's of home and hospital births where the room is packed with on-lookers, and people watching. That's great! IF that's what they want!
However, I see it as a quiet and intimate time. I'd rather be in the hospital with a nurse policing the door for unwanted guests, than to be at home and made to feel like people needed to watch me! I want to be mostly alone, with no one "waiting" on me or coaching me to do what they want...I don't want anyone seeing me in my birthing element, nor do I wish to show my body to others-I'm very private that way.
Anyway, it's just a personal choice. People need to get that. If they've been pregnant (or the SO of a pregnant woman) then they have had their time to choose how they would like to birth, and with whom they'd like to share it with.