About synergy?

Many audiophiles believe in using cables and electronics as corrective devices. The other side thinks keep all your equipment with the same sonic flavor, otherwise you will more then likely end up with an audible mess. Some even think it's a given to match your source(cartridge/cd player)with the same sonics of your speakers. I stray slightly to the same sonics camp, but i'm very curious what others have to say about synergy.