I think the answer is yes, dovetails are frequently done without grinding. Intuitively the dovetail seems a better way (pun intended) than linear bearings as it has a much larger bearing surface, but I lack experience with industrial cnc machines to really know if this is an issue.
there's a bunch of content here on scraping that a search will turn up. here's some pics i took on the subject
http://www.cnczone.com/forums/showth...light=scraping