paul ,maybe i should sign up to an electronics lesson from Brizon and he can explain to me what a zobel network is.

and then maybe i'll come back and explain to you why fitness for purpose is exactly what we are talking about when discussing one cable being different to another.

if you accept that fitness for purpose exists, then by extension some cables aren't up to job, so differences in cables must exist.

and how do well assess that fitness for purpose, we listen to it....

ergo: cables have audible differences. (but directionality isnt one of them).