Kinda goes back to the idea of “For every action, there’s a reaction”.....huh. I’m surprised they didn’t think of this.
The windmills are coming; the windmills are coming!
Seriously, though, I suspect all that thrashing around of propeller blades disturbs the night-time temperature inversion effect near the ground, especially in low humidity environments. The pointy headed Gummn’t PhD welfare pimps know that, but why let details get in the way of a nice fat study grant.