Well, the Airhawk isn't so much soft as it spreads the load more evenly. Most people have issues with hotspots, and that's what it alleviates. A normal soft seat people have problems with probably doesn't support appropriately, ie the buns "sink in" too much but the tail bone gets more pressure than it should. I can see a hard Corbin preventing you from sinking in too much so the tailbone doesn't dig in, I guess.
If that's what's going on with the hard seat, then this does the same thing in a different way.