"What would you do if your doctor told you that you had to have a pacemaker installed so you could live and he told you that it might not work right at first but after it's broken in, it will be fine?"
Is that the only option? I'd take it. Has a doctor ever said such a thing? I doubt it. What does this have to do with guns? Nothing.
What if a doctor told you that you had cancer and the expensive meds probably wouldn't work, but they might. Would you take them? See, I can be just as far off topic as the next person.
What if a tire dealer sold you snow tires but said they might not keep you on the road if it snowed? Hint: buy chains.
Some guns are broken in at the factory and some aren't. Most aren't. It costs too much and, as we know, a whole lot of gun owners will do almost anything to save $5 or $10 on the price of a new gun. It's not just the cost of the ammo, but there's the cost of employees to shoot all those rounds and the cost of additional insurance, etc.
On a different note, I get tickled to no end by folks who will tinker with a computer for hours and days on end to get it just so, but don't have a bit of patience with a firearm with numerous moving parts.
John