its easier to score in todays game, which makes it harder to defend. its a parallel (though not as dramatic) to how the NFL has become such a passing league due to rule changes. its easier to throw the ball now, and near impossible to defend it. matt stafford of all people, an average qb at best, threw for 5000 yards and 40 touchdowns, which ranks among the best passing seasons of all time. so could you imagine what guys like Revis and Richard Sherman could be able to do in the league where physical defense was allowed?
could you imagine what tony allen, a guy that already plays to the limit of how much physicality is allowd in todays game, was allowed to play even more physical defense? if lebron was allowed to mug people on defense?