Google devices are, as I said. Mentioning that other Android devices aren't is like saying other Linux distros don't use RPM in response to a statement that Redhat does.

So are iOS devices that have a passcode and are running iOS 8, and with fingerprint scanning a lot more people have password locked devices. Good article on the subject is here:

http://www.darthnull.org/2014/10/06/ios-encryption

New ones are, I think. The Nexus 6 is. Older devices don't necessarily get upgraded. It's a hardware/software issue, not a philosophical issue.