It does occur to me that it might well be of benefit to someone that needs the HD space in a laptop, but doesn't want, or can't, connect a fast external drive, for example in an aircraft. For the PC, the wear factor is significant as we've previously discussed on this forum.
What is so sad is that I can't have two HD's at the ready, so that a failure can be put right 'down the route' with nowt but a small screwdriver and the backup stick. I intend to try drive swapping just to see what happens, but don't want to annoy MS as they've been surprisingly good to me in the past. Maybe it's because I sold hundreds of packs of DOS and a few Windows 3's - which I said was silly and would never catch on.