I actually would like a stateless computer. A pure functional laptop. It could store state on the cloud as a series of changesets, and each boot would be a "checkout" of the top state. Then as you compute, you make to make new changesets.
I don't just mean wasteful in terms of materials, but also in terms of man-hours, equipment needing to be owned and maintained. Once all factors for the total cost of ownership are taken in to account I highly doesn't it's efficient. It's like everyone growing their own vegetables.