Damaged screw heads really stand out once you notice them, and polishing them back seems like slow, careful work. I can see why you would want to start with the MM rather than tackle everything at once. The point about bad tools or bad handling makes sense, since stripped heads usually tell a story about how something was treated. I am reading along to learn how you approach the polishing without rounding the edges further.
Damaged screw heads really do stand out once you start noticing them, and polishing them back up sounds like slow, careful work. I get the point about bad tools or handling, though I wonder how many of those marks come from years of use rather than outright carelessness. Either way, clean screw heads must change the whole look of the MM once they're done.