Using Applepay to buy bitcoin will get your account suspended among a plothera of other unacceptable practices.
If beauty, fun in usage, or good feelings you get from using hardware is what you're after, then this subject, or bitcoin, is not really for you.
Apple forces you into a closed garden of software, places so many restrictions on you, charges you right and left, tries to force you to upgrade your hardware and you're worried about losing the "great" UI/UX?
I still remember how Apple would not allow its users to change the default keyboard or the background of the OS. What's great about that?