[WalterBright]

Motors always have imperfections, resonances, feedback from the room its in, etc. I don't know if they'd have enough for it to be audible.

[v1ne]

Indeed, motors are physical devices with their own imperfections. But … these are brushless motors, tightly controlled with a feedback loop. They, as they also say in their videos, very quickly follow input changes. I wonder how much weird effects you might hear on those.

[fuzzfactor]

Plus the only way to emultate it is to have the real thing as a reference beforehand.