Depends on the state, but one consistent one is another one you mention, which is getting teacher's some space between the parents. Another element is just giving them some measure of creative flexibility in delivering curriculum. I teach in the corporate world and have had many former public teachers come over. The number one and two reasons for leaving the field aren't pay, they are those other things. Complete lack of creative expression and being constantly bombarded by parents who want to interfere with how their children are being taught.