Both my parents and my grandmother use iPhones now and I do notice the limited functionality they are comfortable with but I believe the problem goes beyond the iPhone and into general tech literacy. I taught my dad to use 1Password then noticed he never uses the biometrics to log in, then reveals the password and memorizes it instead of copy pasting. He definitely set up touchID and has interacted with text before yet in this context forgot they both exist. I wonder if some of these examples like the map direction example are about the same. People who know better just forgetting parts of functionality depending on the context of the problem.