Companies (apple included) can invest all they want in features and press releases claiming that said features are to ensure customer privacy but - unless these features are open sourced and subject to public and recurrent scrutiny - it is just faith that they expect from customers.
If you care deeply about the privacy of you data, don't hand your data on a physical device to anyone.
If you care deeply about the privacy of you data, don't hand your data on a physical device to anyone.