Hi,
Scraping, particularly on figured wood, leaves a pleasant washboard like texture. Many originals show scraping because sand paper was not available. IMO, some modern builders take it to the extreme. On most originals I've viewed, the scraped stock was nice and smooth and the effect of scraping very subtle. Another advantage to scraping is that it leaves clear wood for staining because it does not mash down the fibers like sanding. On dense, hard woods like maple, filling the grain is not hard to do with the finish. However, more open woods like walnut benefit from filling with a slurry of sanded wood and finish or at least a good burnishing.
dave