They are enthusiast targeted brand and majority of enthusiast (heck even entry level cases) have windows in it.

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.