Uriel,
One thing you should be aware of is that there is lots of primary documentation that measures what an aircraft could do, not the limits listed in the pilot's manuals.
The NACA and A&AEE Boscombe Down people were interested in telling combat pilots engaged in the largest war in history what to expect, not in setting conservative peacetime saftey limits.
That isn't to say that there aren't huge unknowns out there, just that your claim about such tests being useless is false.
Others, tossing insults isn't helpful. Please lay off it.