The FAA used to require systems like PBA on the Sikorsky 76....but no longer do.
Just because the FAA requires something does not mean they are on top of things....it just shows what the current regulation requires.
I remember when Soloy began to add Turbine Engines to Hillers and General Aviation Airplanes....that caused the FAA some discomfort but we see how that turned out.
Technology moves forward.....Certification Authorities always lag behind technological advances.
A good example is the FAA and helicopter fly by wire designs....industry had the engineering to move forward and the FAA did not have the equal expertise to craft the certification requirements and the industry had to teach the FAA what it needed to know to accomplish that.
Bottom line....it is still a Robbie that can carry a hundred kilo's of useful load due to the lighter engine.