Thought provoking argument by Mr. Ted, and am glad to have been introduced to him, but for the most part agree with Nicholas.
Public education is the same as public transportation, public utilities or public restrooms: it is to provide a generalized service with a predictable outcome (measured by testing), within an agreed upon period of time.
Public schools are like domestic auto repair shops. They can help with the grand majority of models and their problems. If you bring your Porsche (the gifted or developmentally disabled child, in this analogy) to the domestic shop for a valve job, guess what you will get. I believe in the idea that everyone has a gift and it is only a matter of finding it; but please do that on your own time, and on your own dime.
The majority of children you would refer to as developmentally "normal" in a clinical setting, they have already learned by school age that their purpose in life is to be pushed to and fro by adults. Children are like 400 pound sows: smart, stubborn and low to the ground. How to get them through the gate, if they don't want to go? Well, our "educators" prod them, threaten them, cajole them, bribe them. In days past, they would get a whack on the rear, all to no avail.
Strangely enough, if you put a bucket over the pig's head and push backwards, it moves willingly (if not enthusiastically) forward through the gate.
Try it with your own child, if you like. Tell them they can only draw between the lines, see what you get. Tell them why their idea won't work, and off they go to find ten reasons why it might. Tell them their story can't have any people in it, and see what characters are created. Put the bucket over their head.
K-12 is flush with art training as it is, and it doesn't cost a dime: it's called daydreaming, and enough of it takes place by both student and teacher that extra time does not need to be set aside. Nothing stirs creative thinking like the ennui of mathematics and language.