The Engineer in me has these observations:
Why is it that the outliers, the factory rifle that always shoots .5's and has never been cleaned in X hundred rounds and similar, are always held up as some sort of normal? As how all rifles should be treated?
They're outliers, they are the guy in class who blows the grading curve for everyone else. They are the statistical anomaly. If every rifle made by that mfg performed like that, well then we might have something worth talking about. Specifically, what are they doing that no one else is, and why not?
I get the argument that cleaning a bore can do more damage than good, but I also know that if there's a layer of copper between the bullet and the bore then not much about that bore is going to change with that bullet passing through. If we're trying to smooth out some rough spots then we don't need copper filling in between those high points.
A key point missed by the internal combustion engine analogy is that in those bores it is the same "bullet" that is going to be passing by again. And again. And again, ad nauseum. It is even, horrors! going to be going through the bore traveling in the opposite direction.
With a rifle each "piston" is one time use, and no two are exactly identical (though we do everything we can to make it so).
The quoted steel wool comment is interesting. I have all but quit using brushes of any bristle type on the bores of anything, patches only.
The shooter in me doesn't have enough experience with new barrels to have a valid opinion. Yet.