One thing I have come across in trying to explain phones to older people is that they have difficulty grasping the difference of cellular vs. WiFi and where they can and can't use data.

I have a parent who is terrified to use the internet while on WiFi because they don't want to get a huge bill at the end of the month. I have done some explaining to reduce that anxiety and I'd like to tell them not to worry about it, but frankly, iOS doesn't help at all, both in terms of managing data, communicating how much LTE data you are using, etc.

I know others who spend hundreds of dollars extra per year on "unlimited" data plans even though they have no need for it. But it's easier than trying to manage their data. Imagine how many people who don't understand data usage are spending hundreds of dollars annually on data plans they don't use "just to be safe" because the phone company might send them a $5K bill if they accidentally misconfigure their phone to allow Netflix access to cellular.

If iOS wants to be layman-friendly, there has to be a better way of handling data and communicating to a user what the status of their data usage is. This is just one example.