One set of cables are designed to "fit" the requirements of an amp and a pair of speakers.
Said cable will not work as well with other amps and speakers since they are of different design and needs.
No one cable is good enough for all applications?
Did we just come full circle?
No, no, no! That isn't what I said. Either you're foolish or just being difficult, I'm going to assume the latter. In the case of the example I made for speakers, any 10 gauge stranded copper cable will work for any speaker, in any reasonable length (like, less than 100 feet). 12 gauge wire works just fine for many, many cases. I was just pointing out that you can screw up speaker cable by going to too small a gauge. I was not at all trying to say that every speaker needed a different set of cable parameters.
Any properly designed RCA-terminated interconnect will work indistinguishably from another, no matter what the length. For lengths over, I dunno, fifteen feet, you might want to consider balanced cables (XLR-terminated) to take advantage of common mode rejection, but there won't be audible differences between cables. In the case of XLR cables, anything you pick up in a music store for mics or amps will do fine.
We did not come full circle. Stop it!