You don't? See the reactions to 4e if you want to see what happens when the game gives explanations for how things work.
Heck, people lose their poop over minor lore changes like name changes. Could you imagine the outcry if WotC said, "Well, fireballs work like X."? The outcry would never end. "How dare they tell ME how MY campaign works. Who are they to tell me this?!?!??!"
So, no, it wouldn't give "the DM some better ways to describe". It would give edition warriors a giant bag full of ammunition to flood the airwaves with endless "WotC hates gamers because they are trying to force everyone to play the game the one true way!?!?!?!?!??!" type posts. WotC absolutely learned their lesson in trying to tell gamers anything. Far, far better to just not say anything.