A little history in the development of the helicopter:
The early pioneers actually first attempted rotor wing flight using multicopters, because using more than one rotor seemed to be the natural solution to the problem of VTOL flight.
The very first experimental attempts of taking off with a rotorcraft were mostly done with multirotors. Around 1907 Jacques and Louis Breguet, built and tested Gyroplane No 1, a quadcopter. They managed take-off, although the design proved to be very unstable.
In 1924 French engineer Etienne Oehmichen flew his quadcopter a distance of 1,181ft setting a world record. In the same year he flew a .62 mile circle in 7 minutes and some odd seconds.
The early designers experimented with quadcopters, because the alternative, using a single main rotor with a tail rotor to counterbalance the torque created by the main, seemed to complex to accomplish.
However, three men and their experimentation changed that forever. Those three men are Igor Sikorsky, Stanley Hiller, and Arthur Young.
The single rotor helicopter had huge advantages because it was naturally stable. A weight hanging below a single attachment point naturally ‘wants’ to hang straight down and so naturally corrects unwanted tilting.
Second thing that made it successful is that the design is readily adapted to combustion engine power with relative simplicity.
Basically Igor Sikorsky mastered the design and figured out how to make it work with collective and cyclic pitch. This is the man that forever changed the world of aviation.
As of 2018 it was estimated there is approx 38,140 helicopters in civilian service all over the world, and an undetermined number in military use. Compare that to the airline industry where there is approx 4,850 aircraft in service worldwide. The helicopter is, in fact, the most successful powered aircraft design in aviation history.
The only thing that made multirotors successful in RC is the fact they are simple, cheap injection molded plastic and carbon fiber, and lots of creative marketing. But in the real world where they were tried over 100 years ago the CPPM helicopter won in efficiency, inherent stability, performance and practicality. And that has not changed today.