That's fair point which I both missed and not personally familiar with as I'm an Android user (Android's equivalent of Apple Wallet does require you to unlock your phone).

I still worry about relying on my phone to hold my ID and then surrendering my phone when it's reasonable for the other party (presumably a government entity) to want to look at it in more detail or take the ID away for a period of time (eg during a traffic stop they will take your ID to run you through the computer and write your ticket up)

I also worry functionality like this leads to changes in general expectations which leads to more implementation that may not be as carefully executed