EDIT: I just went off on a rant about why the hell does everything have to be rationalised/explained
Because we're a curious species with a touch of rationalism. Even here in the natural world, when we see things happen, we ask, "Why?" Philosophers have spent millennia working on that. In worlds of artifice, we are doubly curious; unnatural worlds of artifice, fairy tales as you called them, invite this type of inspection in spades. Because fairy tales have meaning. And fairy tales on film have limited time, so everything shown to us has a point -- shots without some purpose are left on the floor of the editing room.
I'm sure there's lots of meaningless chaff in the prequels, but I like to think the team behind ESB had reasons for the choices they made. And I don't think it's unreasonable to look for them.