Why independent allied torpedo tests were harder to dismiss

Why would allied torpedo testing make faults harder to dismiss?

Independent facilities and officers of equivalent standing made the results harder to dismiss as a subordinate's mistake.

Independent Royal Navy facilities could produce test results through officers of equivalent standing to those in the Bureau of Ordnance. Such results would be harder to dismiss than a subordinate's complaint within the same hierarchy. The point is the independence of the test and its author, rather than a named report or date.