Thoughtful comment, but I want to point out that your basis is misleading. His essential point goes beyond eschewing formula, to specifically recommending people use a spoken voice style.

The rationale that I infer is that when people sit down to "write", they enter "writing mode". Writing mode is laden with dogmatic baggage. But the ultimate goal is to communicate, not perform ritual. And since people communicate successfully all the time through speech, it makes sense to suggest that when people write, they don't enter writing mode. Instead, enter "speaking mode" and simply transcribe their speech.