That chart you showed is just an average of states comparing them to each other.

But I'm not going to fall into this trap and argue around the average you think is somehow relevant. It's not relevant. You're just arguing for the sake of arguing.

You don't actually want a rigid national education system with no variety. If anything you're a beneficiary of the amount of diversity we have; under a strict national system where certain things can/can't be studied, your specialty would be much harder to find.