This is probably one of those areas in games were you don't want to be real-world accurate (which may not "feel" or "look" correct), and instead aim for what visually seems correct given the camera angles and distances of your game. Most games prefer to seem accurate rather than looking inaccurate but being technically correct.
Some real world things look too fake (some game developers call this the "Pisa Effect", off of the leaning tower of Pisa), and break immersion ("No way that that would stand upright!"), so you have to tone down the extremes, and some real world limitations look too limited, so you have to increase things to not frustrate or confuse players ("That's stupid, why aren't my units just walking up that hill?").