[Piotrsko]

My helicopter could do back flips, roll and fly inverted, front flips. I couldn't. Actual answer is cyclic. Swashplate makes life significantly more complex, in addition to the precession and system lag. Precession can be anywhere from 45 to 90 degree angle before the commanded result occurs. If you use straight thrust from a motor, response becomes merely a function of spooling up time and momentum/inertia and it is the same across the entire operational spectrum. the thrust has no precession only an anti torque value. In addition for choppers you need computerized mixing because the controls operate ganged, for drones just standard speed controls driven by standard radio controls.
Need more thrust? Add bigger motors and props.
By the way: I dislike the term drone as it refers to a neutered being that is obligated to work tirelessly and casually disposed of after usefulness terminates. Or the resonant pipes of a bagpipe. I fly RPV$.