If the dust landing on the chair creates more dust and the dust landing on the floor creates less, then it matters if the path of the dust is properly modeled. (judithcurry.com)
It does create a bit more dust to accumulate at the base of the piece I am working on - but I manage that fine. (thepurplepaintedlady.com)
I can see where it would have more dust on the lower shelf, but there would still be dust on the upper shelves too. (theinspiredroom.net)