"For the sake of argument, let's say that, hypothetically, Apple is doing work for the NSA beyond what they've admitted to." If this were the case, why bother

"For the sake of argument, let's say that, hypothetically, Apple is doing work for the NSA beyond what they've admitted to." If this were the case, why bother with end-to-end encryption in iMessage and Facetime (both fairly recent products)? It's not as though Apple trumpeted this aspect when they announced the products even though it's extra engineering effort. I'm not sure that even BBM is properly end-to-end encrypted outside of a corporate environment.