The benefit you are looking for on the polishing cloths, is to remove the micro scratches.. Why do we say micro scratches... that so future cliché.
Look for minor little stuff, incidentals, pocket contaminates, etc, the cloth is perfect.
For deep gouges, heck it's a story, I dropped my phone on the scale and now it has a Mariana Trench of a scratch - vs - I did nothing and I have all these blemishes - the polishing cloth is your salvation.