The hits that I have seen flagged all are breaking the new rules around lifting a quarterback and driving them to the ground with your weight on them (look at that aspect of the Mathews hits and he does it everytime)…is it a weak rule open to alot of interpretation? absolutely! but they are trying to save the health of the QB’s so we don’t have every team starting scrub inferior backups towards the end of the season and playoffs…
It took the NHL several seasons to “mostly” eliminate the clutching & grabbing of players with/without the puck. I remember the first season with the new rules and yelling at the tv because of all the weak penalties called. BUT the back 1/2 of that year got alot better as players got more and more used to it and now several seasons later we have a faster more skilled game because of it…