The black fans are really only needed by those who build show piece in those cases with glass panels, but they might equally well need white fans, which Noctua doesn't make. Personally I don't really care about the colour of my fans, you can't see them anyway.
Enthusiasts care about the details - airflow, cable management and of course aesthetics. Noctua doesn't. I respect their engineering/no bullshit approach, the price bump is worth it but they lost my money on multiple builds by sticking to their 'brand color'.
They're the Soylent of the fan world - everything you need but spark zero joy.
I'd be interested in seeing sales figures for same fans in their brand and other colors.
Idiots will have anything marketed to them.