Mr. LFM and I both do same room only, and I highly doubt that separate room will ever be in our future.
There is just so much pleasure that I get watching him with another woman. Mostly, I look over and think what a lucky woman she is to have him as her partner, but then there is the eye contact that we share, the nods, the winks, the touching... I like watching his partner as well, and the pleasure that she's receiving as a result of his skills. (Mr. LFM is VERY skilled!)
It's about sharing, which is only one of the small reasons why we started this new adventure. It's also about respect, (which wouldn't really there for us) if he shoos me away into another room with a man whom I've just met once or twice. How do we know he's not going to try something that goes against my comfort zone? How do we know he'd stop if asked? I think that would just heighten my anxiety a bit. He also likes it when I have a little girl/girl play. I know he likes to watch that and wouldn't that be selfish of me to shoo him off so she and I could play and he wouldn't' get to fulfil that one fantasy of his? I just wouldn't be able to do that to him. I know he likes to watch me and I love to watch him... So it's just our thing that same room will always be a part of swinging lives.
We also find it highly erotic to communicate with each other what we saw with each other and what we felt. I love to hear about his "good time" and he loves to hear about mine. It enhances our own lovemaking for a long, long time.
Like Spoo said, swinging is what you make of it and it's a personal choice. And personally, I have no problem with that -- to each their own. If they like separate room play, that's fine. Same room is just not something that we're willing to give up.