First of all, take a look at the video in comment 410. Car on smooth track. Car using more travel than cheap crap coilovers have. End of that line of discussion.
As far as Mind's question that you quoted, that's largely down to the kind of diffs the car is using. As long as the inside wheels are touching the ground, the car has not transferred 100% of the load to the outside wheels. Depending on what kind of diffs you're running, this can be the difference between the diff acting like it's open and it continuing to act like a LS diff. Additionally, so long as the as the inside wheels is touching the ground, it's contributing some to the lateral grip of the car. It may not be huge, but we're chasing after fractions here anyway.