That is exactly what I used to think but it is not a valid concern. Once you fully understand the concepts of the burr, primary and secondary angles...
Obviously with industrial equipment an experienced welder can get good quality welds with MIG, but I get real nervous when I hear of a novice making...
A fun fact! I had a half dozen or so dead solar-powered calculators of various brands, yes I save almost everything. Out of curiosity I opened one up...