But I do know something else. Later in that scene, Joan climbs on top of Richard, and they kiss. In episode 2.12, The Mountain King, Greg was uncomfortable with Joan climbing on top of him. He treated it as slutty, something she must have learned with a previous lover. It turned him off and he raped her shortly thereafter.
Richard references Roger physically, in general demeanor, and perhaps phonetically. When Roger Sterling found out that Joan was pregnant with Kevin, he refused to step up, to give her the love and commitment she needed, to publicly be the father of her child. But this Roger, while at first rejecting her for having Kevin, quickly becomes the man that Roger wouldn’t be. Richard references Greg in that he specifically asks Joan if she was ever married, and then embraces the sexual part of her that Greg rejected.
Maybe Richard is too much of a fairy tale ending for Joan. Maybe the writers know that and are preparing something dreadful to happen between them. But however it ends, this experience is healing for Joan, because it addresses really specific wounds she’s been carrying for a very long time.