All a matter of taste and how you finish the barrel. Some browning goes quite deep, has texture and wears like, well, iron. Same for some bluing. Others will wear some after a lot of use. Some like the look of wear, but that is another topic.
I have a rule that a gun should not harm anyone by just handling it, so avoid sharp 90 degree edges everywhere (edges of the rear sight especially), but a 45 degree angle on a barrel flat can hardly fall into the "needs to be rounded to be comfortable to carry" category.