S92mach,
That current S92 restriction is just until the FAA builds some experience in the model, based in successful inspections and field service. The S76 went through similar steps. I recall that there were main and tail rotor blade samples bolted to the roof of the Royal Flight Squadron in Amman Jordan, sunning themselves for years. Every several years, a Sikorsky engineer would take one back home and break it on the testing machines to show that the strength was retained, even after strong sunlight exposure for years.
The S92 has a 50 hour 1st service interval (pilot preflight daily of course) and a 500 hour rolling zone inspection, which can replace the annual if one signs up for that program.