Not much, the wire didn't so much connect left to right as upper to lower. On the points models the wanted to be sure the ground path for the condensers was good, thus the wire ran from the condenser mount to an engine bolt. A very direct route. Without the ground path had extra connections, The top engine mount is made from four pieces on each side with a possible weak connectiond between each piece. The wire bypassed all these.
Even after they swapped to the TCI they didn't delete the wire.
On my bikes I like to be sure that the engine mounts all have clean metal to metal contact points between the frame engine and all the pieces of the mounts.
The mounts are how the engine ground to the frame. Poor grounds there deter starter function. When you push the start button full battery power is applied to the starter. The starter grounds to the engine, with bad grounds from engine to frame the battery can't supply full power.
I even have a ground cable straight froma starter mount bolt to battery negitive. Bypassing the engine to frame grounds.
Leo