I tend not to tweak barrels unless running out of rear sight travel. Certainly not for cosmetic reasons!
Mostly because of the thread relief cut at the front of the barrel shank. It's not too difficult to get a bit of permanent deformation in the bore at this area, even just unscrewing the barrel a bit!
A factory induced distortion shown for illustration:
ETA: It's not so much the diametrical distortion that bugs me as the joggle offset in the rifling that sometimes occurs. The ring is usually a few thousandths bigger, but short enough that it doesn't much affect accuracy. Rifling offset seems to do nothing good, though.
ETW&BTW: The lack of a thread relief cut on pinned S&Ws is the only thing I find better from a build standpoint over the non-pinned models. They are just as commonly "off clocked" ("Indexed" seems the better term) though, and the pin on Post WWII revolvers is more for kind thoughts as the barrel top was pre-cut to allow the pin clearance before assembly!