CEFOSKEY, I thought about that point after i had logged off for the day...
Don't forget that for a given thrust there will be a velocity for minimum power due to translational effect. Above this velocity the power requirement goes back up again until at dash speed it is probably about the same as it was at hover. So by designing a rotor which can handle 2.1g in the hover it also means it can do this at all airspeeds. Even so this probably means that X2 could pull ~4g without loosing height at minimum power speed, which is no mean feat.
Conventional helicopters are limited by the retreating blade stall, mostly in terms of ability to pull collective. I suspect that the X2 aerodynamics guys wanted to make sure that the manouvre margin was equally good at all airspeeds, with the FBW limiting g loading if required.
That said, being able to pull 2+g at low speed is still an impressive performance.
