I have come to believe that "proper" is someone(s) judgement and rarely founded in facts, rather, usually founded in fashion. I plan to jolly well shoot what pleases me and not necessarily what fits to someone else's fashion. Time was I'd have said a proper skeet gun had 26" open choke barrels, beaver tail FE, vent rib, single trigger, and low, short stock. I don't say that anymore although I own one such and it do shoot skeet well. My current "worker-upper" has 32" F/Mod barrels, pudgy splinter FA, pigeon rib, double triggers, and stock to suit me. With 3/4 oz loads it is working well. One is no more proper than the other, IMO.
DDA