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Its funny you mention movie theater, as there I would be fine with it. Private party, I don't own the theater, compared to my car and my phone, and I could choose to frequent a theater that didn't do it if it bothered me vs government forcing it on me. I probably would go to that theater though if it was the closest, I don't care if my phone doesn't work while I am watching a movie. I do care when I am a passenger in a vehicle.
Should there be some form of performance metric? Sure. It needs to be very carefully set up though, and the child's own performance needs to be a part of it as well as the parents. NO teacher is going to be able teach calculus to a kid who skips 2 days a week to babysit for his siblings because his parent(s) can't afford childcare. It also needs to be politics resistant, I don't want my kids teacher worried about their job because some new guy won an election. I want them worried about how to best teach the next chapter, and that is it.