I use scrapers extensively for final shaping and finish smoothing. For fine work, I seem to have better control with a scraper than with a chisel, gouge, file or sandpaper - and I prefer the resulting finish.
I am in the early learning stage when it comes to carving - which is still pretty much limited to practice blocks. One area I found particularly challenging is modelling with gouges and rifflers. Yes, I have a reasonable selection and they are razor sharp. I decided to try scraping and made two sets of scrapers with radii from 1/16" to 1/2" in 1/16" increments. One set is square edged and the other is hooked. I find modelling much easier and more precise with a scraper.
Old handsaws are a good source of raw material and a scraper can be quickly made with a hacksaw, file and 1" belt sander. It just takes a little longer if you don't have a belt sander. Considering the ease of manufacture, low cost and utility, I cannot believe 18th century gunsmiths did not make extensive use of scrapers. I think it is likely that, in many cases, they would make a scraper when they needed a cutting tool of a profile they did not have. That includes shaping and carving.
Laurie