I think it's reasonable that if your toaster has modifyable software memory, that if that modifiable memory is locked down cryptographically, that the toaster manufacturer be required to include that cryptographic key with purchase of the toaster, yes.

We've had all these debates. It was called "TiVo". It should be illegal for manufacturers to sell hardware with capabilities specifically denied to the owner. That's not when any sane person would have thought "ownership" meant prior to 1980.