This is a great answer to the question: Why don't they just .... The next stage of technology requires advancement in several areas - like gearing AND the shap

This is a great answer to the question: Why don't they just .... The next stage of technology requires advancement in several areas - like gearing AND the shape and proportions of the blower. While you are experimenting, your solution will be WORSE than the existing technology. Think about the social pressure and shame that might come with that - not every time, not in every community - but pretty often.