Re: Too late
Ignoring the firmware aspect, there's too many people who use computers in "grandma mode". Whatever Microsoft puts on there by default is good enough, and you can jolly well bet MS's security is going to leak like a sieve. Or flat out just copy everything over to secret servers before encryption gets involved. It's like VPNs. It only takes a little knowledge to do a lot of protecting, but many of the masses have never even heard of a VPN.
Not that grandma really has anything to hide, but that's beside the point. Much like a strip search -- it's the inspection itself that is the offensive part, not the risk (or non-risk) of going to the clink after the man with the rubber glove has probed her cervix.