Gloss vs satin

I do not see any practical advantage, or other reason, for applying a dull or semi-gloss finish to a musical instrument. Satin and gloss are basically the same stuff applied at the same thickness. The only thing I noticed about polish - a shiny spot on the top of my previous uke. That's when I learned that when I do certain types of strumming with my fingers I'll rest my thumb above the soundhole. It has polished a small area to a glossy finish. But I'm not a visual person, so that's not a big deal.