The electric ones i've seen are still damn noisy. If you want to make a fan worth a damn to move leaves and debris, you are gonna make some noise no matter how it's powered, evidenced by the fact that it's recommended to wear ear protection still with electric lawn care equipment.

The bigger issue imo is that we incentivize the wrong things. Money and time instead of quality and a job well done. It's faster to blow loudly than to rake silently. A silent landscaping company powered by reel mowers and rakes would clear less properties per man hour, but maybe there is in fact a market there for that premium, nearly silent service.