[quacked]

All acts of deliberate writing can be examined for clarity, concision, fulfillment of their own purpose, etc. If the purpose of an essay is to teach writing, then the writing should be inspired and flow freely. It's only after someone can read and write competently that it's important for them to learn mold their writing for specific, dry purposes.

The second half of your argument is incredibly common, although I don't begrudge you for making it. Yes, it's true that teaching effectively and creatively is near-impossible given the current setup and demands of the modern education system. This should tell most people something about the worthiness of the modern system, but instead most of them defend it.