Yeah, I'm not a fan of that either, but it's hardly the only- or even worst-offender in that regard. The A-4, A-6, Etendard, CH-53, all have that odd quirk going for them. I suppose there's something to be said for not having it fold inward (and thus not requiring a hinge that could jam up or something like that), but it does spoil the lines of an otherwise gorgeous aircraft.