There is quality control, but I imagine that some tolerances are simply not reachable for a certain price. Yes you can have a nozzle with a 0.4mm size and a <0.01 mm tolerance, but what if you'd have to pay 2-5 times as much for that? Would that be worth it? That's pretty much the dilemma that you always face when making hardware.
If the advertised tolerance was publicly stated as +-0.05 mm it would perhaps be kind of okayish (but Ultimaker never state any tolerances). But still, you are saying that >10% tolerance is acceptable for a 0.4 nozzle that Ultimaker are selling...for a printer that prides itself on giving high quality prints? If that's true then I don't know what to say.
Ultimaker is not "a chinese seller" so I would expect better accuracy for the price we pay. If I go to ebay/aliexpress then, sure, I could see that the tolerances could be crap. Usually they are...but sometimes you are positively surprised.
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Anyhow, back to the topic. I though the main issue of extruding 0.40 on a 0.40 it's that the preassure changes. And we need to think 3dmensinally. We are extruding through a 0.40 circumference that will be squished on another area. Slicer makes the math to make that extrusion look like 0.40 making all the math. So, it's easier to extrude 0.46 on a 0.40 with more precision or it's just 'cleaner', or it's just that the software now assumes we use bad quality nozzles.
To understand more about nozzles I always recomend to see the video
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