Egg test is a conceptual test. A more appropriate test would be a 200lb dummy falling a distance that would generate the necessary G-loads.I define it as I drop my fat ass into my seat and there is zero bounce. Friction within the seat and my body/race suit against the seat back and bolsters provide plenty of friction damping. If the test is to bounce an egg in the middle of the seat bottom with the foam cushion removed it would bounce. That means nothing. Who's hauling groceries in their race car?
In practice the load is spread across the seat bottom reducing the deflection and bounce.
Part of a proper fitting race suspension seat is a snug fit, same as a shell seat. This ensures there is friction along with containment and the belts to hold a person in place.
5, 10, 20 G on a 200lb man is 1000lbs, 2000lbs, and 4000lbs of force.
let's see you not bounce then
PS. Dropping your fat ass is like 1.5 G... maybe haha. I would NOT want friction damping to be the method of damping on which I rely. My 2 cents.