What am I missing out on here - Bi- wiring Speaker

Here on Audiogon people suggesting and recommending,if you do not used two individual runs of cables or a shotgun biwire configuration.Then you can use a jumper cables.I am
using a 6 inch set of jumper.They are recommending 30 inches of jumper cables or 1 meter long.What is the ( Sonic difference) that I am missing out on here. Short is not better here and why not. Thank YOU