Second nobody is saying a product with a performance variance (ie anything made on this planet by man or robot) is equivalent to another product of a lesser reputation in a specific area. The most reliable diesel engine, cell phone, or computer on average will still outperform its competition. While you can't guarantee anything you can stack probability in your favor.
Lastly while empirical data is important not everyone is geared to gather it or even realize the differences without careful post analysis. Many of my knives are still near factory sharp, how would I know which of the 10 or so VG10 blades is of a lower performance bin (to abuse a flashlight term) without hogging a ton of steel and materials?
There is what you know such as the average characteristics of a blade steel which is much more than edge retention. There is what you believe based on general averages and the results you have seen with informal use. Lastly there is the grey you have to accept. If you don't accept the grey hand of fate you will go insane.
My main point is don't fear the unknown if someone says it exists. Deal with what you can tell and buy products you believe in. If it feels great in hand and cuts like a demon for hours assume its of good stock. If its not holding up to the other 5 folders you have in M390 start tweaking variables, trade it in for another, or sharpen it more often. This company makes some good ones.
Note: not a rant or flame, just my thoughts brought about by good discussion!
