When I saw the video of the "7 minutes of Terror" and the crazy landing system for Curiosity, I thought, "Seriously, all of these mechanisms are required?".
Then I saw the Schiaparelli, landing, and I thought, "can the do this successfully in what appeared to be a more 'straight-forward' approach?"
We now, it appears, know why Curiosity had the landing system designed the way they did. Only thing crazier, would be to put balloons around a lander and let it bounce to a landing. Could you even imaging such a thing?