most factories don't face and chase bottom brackets. Or maybe they just chase the threads. I just faced a new production frame today that had a lot of distortion of the faces of the bb. It was actually enough to be somewhat annoying. It's pretty typical on production frames to see head tubes that need to be faced as well. In either case, it's almost never just a matter of scraping the paint off. Very few bike shops do this on all new frames, with the thought that the factory does it. Some never do it, and others only do it if they think it's causing a problem.