"rims as soft as butter"
My experience is quite the opposite, when me&my GF went halfway around the planet on a K7, loaded with luggage for two people for six months plus spare tyres. Early on I lost count, how many really bad potholes, corrugations and speed humps I'd hit without being able to slow down. I was really surprised that the rims took it all. I did run a bit higher pressure for the load, though. Have dented many cast wheels on my previous bikes rather easily, and I've heard that "soft as butter"-line before, although never on this bike. Surely they are breakable, but as far as cast wheels go, they seem pretty much up to the job. I would not want to try hitting those same potholes with that much load on many other bikes, almost guaranteed to get trouble. So I basically disagree with that statement.