Except, I suppose, that the Roman Legionary wasn't a skirmisher per se. I imagine the earlier velites would have carried more than two javelins. If I were to imagine myself as a javelineer, I think once I ran out of javelins I would bugger off pretty quick, only using my knife in the direst of self-defence situations! But then again, my commanding officer might tell me different...
Whatever, I don't care, I just love the unit. If a theologian can do this, what's to keep a philosopher from trying too? Now I want to make units... (don't nobody hold der breath, tho!)