When using the rocker start should the back foot be in contact with the side of the base?
To start, this isn't a call an umpire guesses. If an umpire calls a runner for leaving early, odds are that runner left early especially at the NCAA level. If you believe an umpire can be smoozed into or out of this call, what does that say about the NCAA and the quality of the umpires they contract?
This isn't anything new. Even SP players have been timing pitches reaching the plate and moving based upon anticipation of the ball reaching the plate for years. Opinions aside, I think physics would dictate that a mass in motion is moving at a higher rate of speed than one motionless. If you truly thinks this is something that is nothing more than a step, you haven't seen this executed properly. The block (base) to which you refer will also be used by the runner in motion, so I have no idea why you believe it to be an advantage.
OTOH, Stacie is correct that some people just are not comfortable