In honor of Drowning and Falling, I give you... Fighting and Magic!
Back in the old days, we asked the question, "Why does every rule set inexplicably have rules for drowning and for falling, even if these things really don't come up that often?" Nowadays we ask highfalutin' questions like "why are there separate rules for fighting? Or for magic?"
My answer to this is a game in which every scene must have a fight OR spell-casting in it (or both). Essentially, every single conflict must be resolved by fighting, or by casting magic spells.
That's all I got. Does that strike anyone else the way it strikes me?