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Since the first "Fuel Crunch" in 73/74, cars have become increasingly composite: high Tensile steel has been increasingly used for (e.g.) chassis legs, suspension pick up points and etc.
MIG is not in fact much used in automotive manufacture: robotic spot and high resistance welding and increasingly, laser welding techniques are.
Assuming that most, with the best will in the world, "Amateur" welders can achieve excellent penetration, not overheat the parent metals and are using the correct gas pressure, current, wire feed speed and of course, correct type of wire (as HT Steel is different in composition to other cold rolled strip used to press external body parts), is making a series of assumptions.
Of course one should not try and braze dirty parts: but then a welded joiunt with all that included slag is going to be just as suspect!
I don't know what your welding qualifications are, Momus: perhaps you have , perhaps APPE ASME or EN 287, whatever.
Most amateur race car builders would not.
Personally, for parts under a whole series of strain moment, I'd prefer the amateur to use brazing.
Few would have access to good TIG kit: or the correct gas.
But we're all different!
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