Tighter tolerance isn't universally a good thing. It might make the fan more susceptible to damage due to mishandling or dust. They might be selling a fan that has a shorter useful life for no real benefit.

Case fans pull what 4 watts? 5 watts? Who cares if it pulls 200 milliwatts more than a competitor when it's cooling a GPU and CPU that consume more than a hundred times what it can consume

Yes, exactly. The high precision is marketing, not something needed in the product.

Well, I have a bunch of lower-end black fans, some of them quite old, from before transparent cases were a thing. They're actually pretty much gray if I don't wipe them off.

Noctua's signature... brown-orange? Whatever that color is, it has the same issue. The blades are basically gray if I don't wipe them.

Haven't seen anybody start a gray craze, though. Though I have a grayish motorbike that also shows dust and dirt like nobody's business (it's a bike I use strictly on paved roads).

I have them. They get dusty at about the same rate as a pure black fan (which also shows gray/brown dust quite easily). I need to clean mine about every 6-9 months to keep them looking good enough to "show off". I generally run a Winix HEPA filter in each room of my apartment.

I don't think matte white is worse than matte black in terms of showing dust. They both do.

Black cars show road dust immediately. White cars don't. I image it's similar for computer fans

Dust can actually be more visible on black than on white.

TIL: Generally all plastics exposed to UV start to photodegrade. If you google why old computers turn particularly yellow most sources point to bromine-based flame retardant agents in the plastic, but some people make a convincing case[1] that ABS just naturally turns yellow in UV light.

Not much real research into that topic, interestingly.

[1] https://medium.com/@pueojit/a-look-into-the-yellowing-and-de...

With Noctua I highly doubt that is the case given their track record for quality overall and all other information available around their design and engineering process. As far as I know based on all the information I have seen all the design and engineering is done in Austria. They also have a track record of only releasing things once they are satisfied something performs within their standards. Something that would be next to impossible when solely relying on external fabs and process engineering.

They also utilize different manufactures afaik (historically Taiwan, but also China these days) meaning they need to have pretty solid in house knowledge and expertise to make sure different factories produces similar results. When they first started utilizing Chinese factories people noticed visual differences and were worried about that. But Noctua at the time claimed that they made sure that performance was still the same. A claim that was put to the test by various review outlets at the time (I want to say gamer nexus did a big piece about it?) and confirmed to be true.

Having said that, if you do utilize external factories you automatically are making use of their process engineering to some degree as well. But, and this is difficult for many people to understand, that isn't a binary thing either. You can entirely rely on the factory to basically do everything for you and just send feedback on iterations but you can also work closely with them and actually get involved in the process itself.