It's not silly, and not to be underestimated. It quite depends on your living environment. In Holland I could've lived without and clean once in a while. Currently I live in Shanghai, and cities like this are very dusty. My current Ncase M1 I'm very glad with my filters, the amount of dust buildup on the intakes is considerable. Its easy to clean and the internal space remains clean. I prefer my temps rising by blockage of dust buildup vs. all that dust flying into the case and settling on all the components. No filtering is my main holdup to get an A4, and keeping an eye on the C4 how/if it will be a feature. Demciflex on the outside is not a solution for me. At a minimum mounted on the inside.