Which is surprising how? Android's aim has always been to be open for manufacturers and providers. The user-wise openness is an implementation detail and may or may not be there.
And the more time passes, the better manufacturers and carriers get acquainted with the platform, the least common Android devices will be open as far as the user is concerned.
And the more time passes, the better manufacturers and carriers get acquainted with the platform, the least common Android devices will be open as far as the user is concerned.