What gets me in these discussions about idiot marks is that someone always comes along and says something like "It's just a tool guys! stop babying your tools, marks and scratches are signs of use, and are totally honorable."
I assume that after reading that some one else will toss their new 1911 in a rock crusher to show what a great pistolero he is.
There is something to be said for honest long term careful use wearing any gun out, finish wise, and that would indeed be honorable and no shame at all. But scratching the frame with the slide stop is a sign of something else entirely, carelessness and incompetence.
I have a theory. Most handguns are not in fact carried every day, except one's carried by military and LEO's, hence most idiot scratches happen to guns that should have gone 50 years without any carelessness marks. Most guns get shot a few times a year, are probably disassembled and cleaned way too often for the amount of shooting done with them. Kind of a shame, seems to me.
A good machinist's tools look slightly used after thirty or forty years, you can tell that they have seen daily use, but not abuse. A bad "machinist" can't make his tools last a year.
Guns are very much the same.