One comment was the 4-ball wasn't a good test because it was so inexpensive to do. Low cost doesn't make it a bad test, nor does high cost assure a good test.
People that want independently conducted tests are only using accepted scientific method theory...that a test result must be reproduceable when done by others. This recognizes the inevitable bias that occurs in any test, which, simply put: Any test result observation is affected by the observer...even if the observer is a machine. Different machines are calibrated differently, different people are biased differently. There are all these variables inherent in any test, so, if these tests are repeated in many different labs, and the results are consistant, THEN you can put more and more faith in the results...until then, it's just numbers.