I think it's a little unfair to blame the aircraft as many want to do.
If it is "unfair" to blame the aircraft....why is it "fair" to blame the Pilots when we all know there were a whole raft full of causes to this crash? The old "chain" concept is well proven here.
If A-VRS was well understood prior to the crash....might the pilots not been better trained and educated about such risks....and perhaps might have waved off prior to losing control effectiveness?
As this is unique to the tilt rotor design....why can we not assign some fault to the aircraft?
Some of us quite happily blame the Pilots....why not the aircraft?