I think that would fall under "tinkering on the margins" as the person you replied to phrased it. An example of a more systemic change would be elimination of

I think that would fall under "tinkering on the margins" as the person you replied to phrased it. An example of a more systemic change would be elimination of any head-to-head impacts that might occur between defense and offensive linemen on any given play. How do you work to eliminate those without changing the game into something unrecognizable?