1) RTP is between downs. This means that if a team gets a turnover on the play, they keep the ball and penalty is marked off. This will prevent weak RTPs from drastically altering games.
If the defense keeps the ball on a turnover, you are incentivizing defenders to intentionally target the head of QBs, hoping to knock the ball loose. Sure, you'll get a 15-yard penalty, but you now have the ball.
2) No body weight rule. This is tackle-football, not flag football.
I agree with this change. The body weight rule is being enforced in a way that is simply absurd.
3) Judgements on hands to the helmet. How hard are they? No blanket, "Any time the hand hits the helmet it's a penalty".
This is already the case. If a defender has wrapped up a QB and his hands happen to touch the QB's helmet on the way down, that is not an automatic personal foul.
4) No low hit penalties. Again, this is tackle football. If a defender needs to wrap the quarterbacks legs to make a sack, he should be allowed to.
After the injuries to Carson Palmer and Tom Brady, the league decided that allowing these kinds of tackles on passers is not worth the risk of injury. And this is not the first time such a decision has been made; although the NFL is indeed
tackle football, horse collar tackles were prohibited nearly two decades ago, due to the same evaluation of injury risk vs. impact to the game.