Quote from Dozy Wannabe:
"Is it not therefore reasonable to infer that the BEA compared engine performance data at take-off and during the accident sequence against both each other and an optimum set of test data - and found no significant anomalies?"
If one believed beyond any doubt that the BEA carried out a wide-ranging, impartial, and fully-informed investigation, that would indeed be a reasonable inference. But it would cut no ice with the BEA's detractors, and the bureau itself is unlikely - if you'll forgive the understatement - to enter into discussion on any alleged deficiencies.
Alternatively, we can all accept the findings and suspend further discussion...