Because tau is more intuitive and this is all about intuition. If you were baking a pie (pi?) and someone told you how much of an ingredient to add per half pi

Because tau is more intuitive and this is all about intuition. If you were baking a pie (pi?) and someone told you how much of an ingredient to add per half pie, that would be less intuitive. And no, I do not get confused by concepts like 90 degrees, but this is about inspiring intuition, not the ability to do calculations without error.