Apple's security model is not the only one that exists, and its model has the additional benefit of giving them the ability to control software distribution for the platform.
That said, on the back end outside of devices, they don't implement the same precautions. IE encrypting iCloud data / backups where they have limited access. I would like consistency is all.
One way or the other.
I would love it to be encrypted through out. Even it if means, that if I lose access I may not be able to get it back. It's a tradeoff. The marketing position of being secure is factually true for the phone, but they imply the data is when in fact it really isn't.