You're forgetting the UX designer, the UI designer, the UX researcher, the UI translator, the database administrator, the system administrator…
We have always been able to break complex tasks down into multiple, simpler job descriptions. That doesn't mean each person is limited to doing at most one of them.
We have always been able to break complex tasks down into multiple, simpler job descriptions. That doesn't mean each person is limited to doing at most one of them.