ANY polishing overdoes it. Period. Remember when the watch is produced, the case is oversized, blocky, and sharp. The initial polishing breaks the sharp edges, and gets the case shape and surface finish down to it’s final, intended form. Further polishing beyond this only erodes the final geometry. You are correct to leave the case as is.
A more everyday example you can use to picture this is pouring water over an ice cube, or a melting ice sculpture. But any polishing effectively will reshape and shrink your case.
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