Ah, I think I see where we diverged. You were focused narrowly on the technology, I was focussed on the broader situation, where I don't see the equivalent of t

Ah, I think I see where we diverged. You were focused narrowly on the technology, I was focussed on the broader situation, where I don't see the equivalent of the franchise owner or the ice cream consumer in your dialysis example; if nothing else unlike the ice cream machines the dialysis units mostly function well for reasons related to how the two situations differ. There is some tech parallel I agree in e.g. protecting consumables , but that’s an aside in this context , and largely symptomatic if the way health care is paid for in US that drives towards a razor:razor blade model. Anyway that was a long walk for a short drink of water!