I don't mind seeing tool marks...in fact, I like to see them. I just don't like little gouges, or dips where there shouldn't be.
Super fine surfaces simply were not expected 200+ years ago. Remember, this was a job to these people, they had to make money and get these guns out the door. Besides, the vast majority of people would NOT notice, nor would they be able to appreciate the gunsmith taking inordinate time to finely sand every surface to a glass smooth polish.
So far, I have seen VERY few 18th century guns (and in photos only) that show the kind of "perfection" that is desired by some today. Very few. Everything else I have seen, even "high art" guns made for royalty show pe-lenty of tool marks. Rough backgrounds to carving, scraper marks, file marks on metal, etc.
I have this one old German gun, about 1720 or so with a wonderfully original surface. Never sanded down nor refinished. I wonder what the original finish was..the grain is fairly open, other than the dirt ground into the fore end. It exhibits no real trace of anything. I waxed it just to make it look like something again. Tool marks all over it. It's not rough, mind you, but the surface shows facets where the scraper ran across it. Hard to tell from my photos, but maybe you can see in this one what I mean:
The wrist is not really round, but it is made up of a multitude of narrow flats on the wrist where the scraper was run down it!
The triggerguard, on the other hand is magnificently well polished...much more finely filed than I usually see.
Somewhere I have a "contraband" photo of a chest of drawers made in Lancaster, PA with a wonderful potted flower design carved into the crest. The background of the carving is just left as it was chiseled away. Rough and gouge-marked, which would absolutely mortify some people today, I'm sure. It is magnificent.