"In actual deployments it's going to be a lot less since ~nobody is running a noctua fan at 100% speed unconditionally"

I run dual 36w Delta fans at 100% in my computer case. I use the outflow as positive pressure forced exhaust for my enclosed CO2 laser, which itself has an ultra-weak venting fan.

It isn't that loud. A simple no box does the trick.

Yeah, but those aren't noctua fans. Noctua's claim to fame is being lower noise, not moving the most air. I'm sure somebody is buying a premium low noise-focused fan and then pinning it to max, but that's definitely not going to be typical.