The big issue with CTE is that the NHL and NFL deny it is caused by concussions or deny it completely.
I have no problem with checking in women's hockey, and it has made it more exciting just no open ice hits are allowed currently. All levels of hockey need to call anything to the head a major, the cross checks to the head are getting bad and happen more than checking from behind in games. Fighting in hockey has its time and place, but it is always after a clean hit or a dumb reason like 4 Nations.