Full loom of the same cable brand vs mixing and matching.

Some say, for synergy sake, you should use the same brand of cabling throughout your entire audio system (a full loom).  However, as an audiophile for over 25 years, I've never adhered to that philosophy.  As a matter of fact, I currently use three different brands of cables in my audio system with excellent results.  Do you stay faithful to one brand of cables in your audio system, or do you mix and match, as I do, and why?