So what if we're in a class where we can't make over 350 whp and want to be as close to that as possible without going over regardless of air density? Need to be able to adjust the tune to be more aggressive when it's hot out or less aggressive when it's cold/dry, etc.

What if it rains and the car would be faster with a "rain map" that has less torque at lower RPM for less wheel spin?

What if you want to run in 2 different classes which require 2 different HP levels?

and so on... there are reasons for not being dependent on a far off tuner even if they might be "better" than you in general.

Justin has nearly infinite room in his car to do whatever. Maybe you haven't seen his threads?