Is this you personal definition?
No but it is what the British Mil believe (quite rightly in my opinion) which is why pilots do rotors running ground runs and not engineers.
I always forget you're a perfect pilot who only operates in a perfect world
a bit unnecessarily personal but not unusual for some on this forum.
Getting away with it for 50 years doesn't make you safe - just lucky. And any modern Risk assessment as part of a Safety Management System would tell you that.