No we need schemes in today's NFL without hard hits and without any type of intimidation factor for going over the middle or even QBs can hold the ball longer because they know guys can't come in there all out or they might get flagged or fined for breathing hard on a QB lol! Since all these rules are to benefit the Offense! You used to have to worry about getting your ass knocked off if you dared to go over the middle or even on these zone read plays no way they'd be effective if old aggressive rules were in play QBs would beg to stop running the ball! SO AS A DEFENSE NOW YOU HAVE TO CREATE CONFUSION OR DISGUISES TO HELP YOUR DEFENSE FOOL THE QB's READ OR EVEN CHECK HIM INTO A PLAY YOU WANT HIM TO CHECK INTO LIKE SHOW COVERAGE THEN RIGHT AS THE BALL SNAPS YOUR LBs and SS ARE COMING DOWN PLUGGING GAPS! SO YES SCHEMES ARE NEEDED! Also I believe if your just a better team and you know that you can stop them without the extra movement it probably does keep guys fresher and a little faster to react if they are positioned already in the right spots, but IF YOUR GOING UP AGAINST AN ELITE QB YOU BETTER BE READY TO DISGUISE YOUR DEFENSE OUR YOU'LL GET PICKED APART!