In grad school I asked that so many times trying to figure out why it was the "right" solution and this historical cheat caused so much cognitive dissonance.
Then again, on the other hand, "calculus works nicely" and "it's simple" probably are good spooky directors toward useful models anyway.
Then again, on the other hand, "calculus works nicely" and "it's simple" probably are good spooky directors toward useful models anyway.