You are of course correct in your interpretation of the Scout Conference. Note, I said "would not seem." To you, it seems to be "it would seem." I have a lot of stainless Rugers, and would suggest that the matte finish is at best borderline in the "subdued" regard, in my experience. Of course, Cerakoting (I've done a lot of that, too; I'd have to get a bigger "oven" to cure a barreled action!) would bring us into violent agreement.
If I recall correctly from Cooper's other writings, the most salient feature of a stainless barrel in this context was the inside, that is the contributions of the stainless steel bore to performance and function.
While the flash suppressor is indeed an affectation, the threaded barrel is a convenience and easily finished with a thread protector if desired. I'm going to do some experiments with a PRI muzzle brake (please, folks, don't call it a "break," unless it's well and truly broken), which would not be practical with an unthreaded barrel.
I would further suggest that the Ruger Frontier is closer than the GSR to the "real" Scout Rifle than the GSR, though the lack of iron sights is a handicap. Perhaps a set of GSR sights could be adapted. It's interesting, at least to this writer, to contemplate the evolution from Compact to Frontier to GSR.