The primary problem of the phone is that it's a lineal descendant of a technology that was unavoidably based on "stop what you are doing and pay attention to me

The primary problem of the phone is that it's a lineal descendant of a technology that was unavoidably based on "stop what you are doing and pay attention to me". (Contrast telegrams, from the same era.) It's not just that voice calling necessarily interrupts you (or if you arrange that it goes to voicemail, this is considered rude), it's that the whole mental model of a phone is a thing that interrupts you.