The thing about case pressure does actually matter a lot for dust management. Positive pressure makes the case build up far less dust because air will only flow into the filtered intake, and will flow out through the outtake as well as any openings or gaps it can find, which prevents dust from flowing into the case except by possibly making past the filter.
Why do I care what ICANN says I can do on my own network? It’s my network, I do what I want.