solar charge controller analogies

I was in a weird mood today:

PWM is like a turtle on its back when battery voltage is low. It struggles until it can get back on its feet, after which everything is fine. Adding in isolator charging turns the turtle over and onto his feet. Example: When the battery is 10.5v a 100w Renogy poly {on PWM} would make a _maximum_ of 59.91w (5.63A x 10.5v). At 12.1v it would make max 68W. At 13v it makes max 73w. MPPT is a weeble that can't get flipped onto its back, but costs 3x as much.