Out of my 24 Ka-Bar BK&Ts, only 1 had a perfect edge (BK15). All the rest were anywhere from "slightly off" to "how did that pass QC". Whether they were stamped or etched did not matter, so it has been going on for a while with few complaints. All three of my BK20s have uneven edges.
Does it matter? Only if I am looking at the edge - all of my users (BK4, BK5, BK7, BK9, BK15 and BK20) have exceeded my expectations in terms of functionality. So much so that 18 NIB Beckers are in my collection, along with 6 NIB Camillus BK&Ts. At this price point, I feel like I get more than my money's worth with every BK&T purchase.
However, as someone with mild OCD in terms of neatness, the uneven edges make me want to scream upon initial inspection every time. That feeling almost immediately subsided.