Passive cooling has no "feel the power" , they are for silent operation not power operation. also they are cleaner and dust does not enter the case.
however , once they use the fans even at 500rpm , they allow dust in eliminating a major positive of a Passive PC.
Technically, if the radiators are inside the case, then without filters, dust can enter the case. Because major mode of heat exchange is through heating of the air, irradiation is minuscule. Airflow is the king, a filter underside on air inlet would eliminate dust, but also decrease performance.
So, if you want a silent PC, you can have fans, but the deeper they're hidden inside the case, the better for silent operation. If you build a fanless PC, you also get an advantage of no mechanical parts that can break. Those are two distinct design points. I have a Noctua NH-D15 heatsink and even at 700RPM, it's inaudible, thanks to it being inside a Define R4 case. More noise is generated by rotating disks - I don't see any super duper enclosure around the disks in this design. But I have to clean filters once in a while - the case have them hot-swappable, fortunately.
Further regarding this design : placing the fans on the top of it makes them more audible, than placing them underside.
I also miss handles to move it around, or wheels. This is going to be heavy. I also miss pressure derating of its performance, because at higher altitudes, pressure leads to less contact of air molecules, hence lower cooling performance. Irradiation is really minuscule here. Maybe I've overlooked it.
Funny story about our own passive cooler(case) CooliPi - but for Raspberry Pi - which had no compromise design goals regarding both fanless and passive operation - actually the first customer who used it with a recommended Noctua fan responded that its cooling performance is "unreal", after he ordered a fan beforehand before he even got the cooler.
Well, the design points was that it'd be the best cooler on the block even without a fan, the fan only needed over some >50˚C ambient temperature.
Practically, when using an overclocked Raspberry Pi as a workstation, most of the time it's idling. No fan needed. Only when playing some HD video it's loaded enough that it heats somewhat. And the usage scenario with this abovementioned case may be the same - if you don't load it, you don't have to spin any fans, hence it's fanless and passive. You only need some circuitry to spin a fan only when it's needed.
To wrap it up, even though I've designed my own massive coolercase for the Pi, I'd still go for a somewhat traditional PC case, because of the sound of rotating disks. I bet a user of this case would need lots of storage and rotating disks are still cheapest - and loudest part of contemporary PC. But maybe I'm wrong and the customers with deep pockets can afford some mutli-terabyte SSD storage. But I'd be scared of it's cooling, because the fastest drives come in M.2 form factor, not SATA. Hard to reach them with this heatsink and cool them properly...
... funniest story at the end.The loudest thing of my PC setup is the monitor. Yes, it has two fans. Good old IBM T221 with 16:10 4k screen. Unmatched even today.
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