I think because the 'state', isn't. Think of the number of times your computer has crashed, had memory wiped, new OS installs, been stolen, replaced. Did your

I think because the 'state', isn't. Think of the number of times your computer has crashed, had memory wiped, new OS installs, been stolen, replaced. Did your bookmarks from 15 years ago survive? With mobile phones identity works a little better and likely because of SIM cards.