She honestly was offering 0 new for the time period, 0. I say this as someone who had that many people alive at the time doing the same stuff. Open marriage isn’t any more common but it’s there and it was there during her time. Everyone you listed gets credit for offering evidence of what they’d found making them concrete, nothing about Mrs Rand sharing her sex life would have been so scandalous at the time it would have costed her a social life. Had she been cheating it would have been different but when a good chunk of others are doing it it’s not new