Originally Posted by niznai

Change rubber tires to foams and you won't need flex anymore.

Flex is a compromise due to scale. No spring we could make for our cars could span the range that would allow the car to roll about in corners to generate grip whilst at the same time keeping the car off the ground. Our suspension is mainly keeping the car off the ground whilst flex does the work in the corners (not entirely, but close).

Our cars are also overdamped most of the time, so the spring/shock combo would almost never have enough time to react. The shocks work most of the time in pack regime hence the often discussed importance of pack.

And this is all because rubber tires have nowhere near the grip potential of foam for the loading our cars can put on them and the power we are trying to put on the ground.