I don't think there is a mandatory final call, just a joining the circuit call. From my observation the folk who call every leg are the least likely to respond to any call directed at them, they simply keep reading out their position which is an easy thing to teach from a school perspective I guess
Heard the other day: "Jabbything this is Qlink, is this circuit for a touch and go or a full stop?"
Jabbything: Jabbything downwind 24
Qlink: "Can you confirm it for a full stop or a touch and go?"
Jabbything: "Jabbything turning base runway 24"
Some decent education is badly needed.