And this is probably coming, a few years from now. Because remember, Apple doesn't usually invent new products. It takes proven ones and then makes its own much nicer version.
Let other companies figure out the model. Let the industry figure out how to make it secure. Then Apple can integrate it with hardware and software in a way no other company can.
Right now we are still in very, very, very early days.
Imagine if the government would just tell everyone how much they owed and obviated the need for effing literal artificial intelligence to get taxes done!
>> respond to emails
If we have an AI that can respond properly to emails, then the email doesn't need to be sent in the first place. (Indeed, many do not need to be sent nowadays either!)