Your layering does not really have practical consequences that would matter to exclude a field for engineering. Plus you are focusing on the technologies, and w

Your layering does not really have practical consequences that would matter to exclude a field for engineering. Plus you are focusing on the technologies, and while this is important this is really not what distinguish an engineer from a non-engineer technician (even an extremely skilled technician), and that part have way more things in common regardless of the field.