The NFL changes its rules a lot more than the NRL and in really creative gutsy ways, but it does so in a pro active way.
They have an objective (lots of touch downs from passing plays because they are entertaining to the fans) and once the game even looks like being dominated by defense they adjust the rules. Currently they are likely to get rid of kick offs which is to do with safety but also they dont think it is very entertaining. \
I would love for the NFL to run Rugby League. I cannot even think of the last gutsy rule change the NRL made.
Of course kick offs aren't entertaining.....they've moved the point of kick off further down the field so now all of them sail out of bounds beyond the end zone with less possibility of a return and potential concussion incidents. kick offs are where all the brutal blocks and hits were.
NFL clubs all offer their teams and players to media too, something that doesn't happen in the NRL, hence journos here need to go a dig up shit or uncover a scandal to get any news.