Trusting a company to provide a good client-side encryption implementation and trusting a company to safely hold encryption keys in escrow are two completely different issues.
I wouldn't hand over disk encryption keys to Apple no matter how much I trusted them, purely because they're in a form where Apple could access them without my intervention, and they could conceivably be legally forced to hand over those keys by some government entity in the future.
Apple's argument against decrypting iOS devices hinges on the fact that they don't retain those keys, and therefore can't decrypt them for the government.
I wouldn't hand over disk encryption keys to Apple no matter how much I trusted them, purely because they're in a form where Apple could access them without my intervention, and they could conceivably be legally forced to hand over those keys by some government entity in the future.
Apple's argument against decrypting iOS devices hinges on the fact that they don't retain those keys, and therefore can't decrypt them for the government.