Let me ask this: How else would you measure the quality of the educational process? Would you base it on the specific content committed to memory? Would you measure it on how to apply the concepts you have learned in the real world? Also, where is the "cliff" between "good" educator and "bad" educator? If there's a concept in mind, it has to be executed in order to realize the concept. High educational standards have been a concept for a long time, touted by both Democrats and Republicans. The Bush administration chose to quantify this standard (NCLB), and the Obama administration chose to enact a one-size-fits-all execution plan (Common Core). We could argue about their merits and issues until the cows come home, but the fact of the matter is that a concept was asked to be executed, and it was.
With a public school system with compulsory education, everyone must be educated. And there are some that just won't "get it" using the presently taught means. How do we set them up for success in their community?