What is the threat model that concerns you? If you don't trust Apple then don't use iOS full stop.
I trust Apple engineers, but not Apple Store employees. So, for me the question to ask is what effort is required to circumvent the system. If any employee at an Apple Store can circumvent your encryption then that is an issue. If circumventing requires your passcode, then that's far less concerning.
I trust Apple engineers, but not Apple Store employees. So, for me the question to ask is what effort is required to circumvent the system. If any employee at an Apple Store can circumvent your encryption then that is an issue. If circumventing requires your passcode, then that's far less concerning.