It's a pain in the ass, thats why. It's hard to explain and it's hard to implement. And don't forget about mobile: If your locked down phone is compromised (and I wouldn't assume it's not), then even if you have PGP running you can forget about security.
Heck, even your desktop can be completely compromised. I think there's a big chance it is. If not by the NSA then by some malware.
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It's a pain in the ass, thats why. It's hard to explain and it's hard to implement. And don't forget about mobile: If your locked down phone is compromised (and I wouldn't assume it's not), then even if you have PGP running you can forget about security.
Heck, even your desktop can be completely compromised. I think there's a big chance it is. If not by the NSA then by some malware.