Additionally, the energy required (relevant to total mass) to generate lift is a lot smaller at this scale thanks to the Square-cube law[0], and it's a lot more

Additionally, the energy required (relevant to total mass) to generate lift is a lot smaller at this scale thanks to the Square-cube law[0], and it's a lot more efficient to flap a wing on an as-needed basis than to run a rotor at a continual and steady rotation. [0] https://en.wikipedia.org/wiki/Square-cube_law https://en.wikipedia.org/wiki/Square-cube_law