In the analogy of shoes, the two serve different functions (ie it would be unreasonable to suggest only having one pair of winter boots if you live somewhere which has four seasons). With a dynamic and electrostatic system their purpose is still to make music.
A completely minimalistic rig to me would be something that you use all the time for listening to music. A transportable system that you can use all the time would probably be the ideal scenario. I like to think I'm building towards a minimalistic rig since I only listen to music at home and I'll only have one headphone.
I like to think having one headphone and one speaker system isn't cheating, but it probably is
That brings up another question...does having a quarter million dollar speaker system qualify as minimalistic? No headphone system, no other speakers...nothing else to listen to music on