The Problem;
At the birth of rotorcraft in the US, Igor's simple
VS-300 single-rotor helicopter was in competition with the more technologically advanced
Platt-LePage XR-1 symmetrical twin-rotor helicopter. The simpler craft won the contract, due to the government's desire for fast deliver.
The single-rotor configuration thereby became the predominant configuration.
The Dilemma;
How can anyone hope that the predominant Sikorsky will ever produce the superior symmetrical twin-rotor configuration?
To do so would be an admission that they were wrong in the late 30's, and, that they have perpetuated the error for 70 years.