Even the most accurate scale models ever made are not 100% to scale.
Well only for those who don't have a shrink raygun or a 100% accurate model to work from.
If you're saying we can't model the dust, well again ok! Accuracy in this way becomes very subjective.
Another way to look at modeling accuracy is to say that at this scale, you cannot see a 1/8" diameter bolt, so why to I need to model that to be 100% accurate.