I for one disagree!
I think it is a mindset we have been used to for so long, we don't actually stop and look at the reality of the world around us.
Eg: We live IN the world, NOT look down on the world, as we do with a model railway!
From that perspective, I would suggest that you would find layouts have to few trees and trees that are to small, except in some circumstances like deserts etc.
Khris