That's a lot of dust. However, I don't see how this leads to more dust going into the computer compared to e.g. front-facing ventilation. The dust landing on

That's a lot of dust. However, I don't see how this leads to more dust going into the computer compared to e.g. front-facing ventilation. The dust landing on the desk next to the computer will slowly drift down onto the surface, passing right in front of any opening and being sucked into the device anyway.