My point is not to say that engineering doesn't count. My point is that the sonic results AT THE EARS and in IN THE CONTEXT OF THE SYSTEM BEING USED is the ultimate "test".
As I have been involved in the cable business on the sales end, I have seen many situations where very expensive cables have fared poorly and were replaced with inexpensive cables, and vice versa. In all cases, the cables had good anecdotal reputations in other systems. Nothing is perfect in every application. The fairest method is offering a trial period for the user to asess the performance in his/her system context, for his/her preferences in sound. We do this, and so do some other cable makers.
In some cases, what we thought "should have been better" was not better in the views of the user. Was the user wrong? No. The user must decide for himself what he/she likes or dislikes in conjunction with their other components.
It is impossible to say that any particular cable will be preferred in any particular system. Too many variables involved, including user preferences which cannot be predicted.
When someone calls me to try our cables, I never say that our cable will be sure to beat out whatever else they are considering. I only say that our cables are very good, and stand a good chance of being the best ones that they audition. If this doesn't turn out to be the case(with them as the sole judge), they can send them back for a full refund within 30 days. I don't know how to be any fairer than that.
DISCLAIMER: I work for a company that manufactures audio cables, vibration control devices, racks, stands, audio electronics components, and speakers. All have a 30-day money back, 100% satisfaction guarantee.