Finally, you have the last leg from Perth to Brisbane, with a 4-5 hour grind across the continent in a narrow body jet with typical narrow body seating. Rather a comedown from the international widebody seating, and at the end of a long trip, it is simply unpleasant.
As already pointed out, 3-4-3 configurations on 777 equipment is quite widespread nowadays (EK, EY and even KL).