> In a society where people can play back and re-live prior memories, it would not suddenly come up that one can relive experiences with past lovers.

I think this episode was one of Black Mirror's strongest, because not only would it suddenly come up, it does to a lesser degree with the technology we have today. I've been the guy obsessively replaying painful memories from old photos I have. I don't think it was really presented as though the characters are the first ones to ever think of the idea.