Paul Farquhar
Legend
It certainly can involve social interaction, or violence, but most characteristically, interaction with the world itself. Surviving alone in the desert of Arrakis is not social. It's all about learning how the alien environment works.Yeah, but a lot of planetary romance is about social interactions with new and weird cultures, politics, and the like.
Frank Herbert's Dune should qualify as a planetary romance, for example. As does Robert Silverberg's Majipoor series, Philip Jose Farmer's Riverworld, and C.S. Lewis' Space Trilogy. Most of which are dominated by social interaction, not combat.
So, the point about D&D not having the mechanical chops still holds.