Are people really worried that they will polish the shiny steel away? The polish removes microns of the finish. I think it would take a very very very long time to do permanent damage to the finish by polishing. I have a stainless steel watch that has a near mirror finish. I have polished every couple of months for nearly the last 20 years....still looks like new. I can safely say that nobody will be keeping their iPhone X in daily use for the next 20 years.
Good for you but the iPhone X is not a watch. There are other components that get affected if not careful...like the screen coating.
Also, just the thought of removing something from the phone (even ever so gradually) makes me cringe.