Hence the standards are not entirely specific, and are meant as guidelines, and mention how units are affected, but only give suggestions as to values.Its just some map makers will consider different things different trerain. Because map's dont use the same textures, sand will look different from map to map. Of course theres nothing to stop people hovering the mouse to find the name of the terrain, but if you want to be able to know things instinktivly then you would not do that.
If I am playing a snow map in which kbots are slowed down more than vehicles, and then play another snow map, I should reasonably be able to expect that the same result is there. The values might change slightly, according to the map makers balancing preference, but the same idea is there.
Otherwise, if similar looking terrain affected units completely differently at the discretion of the map makers, not only would it be impossible to pick up and play maps, it would become incredibly confusing for all players. Imagine trying to remember whether it was Painted Desert or Desert Triad which kbots where faster than vehicles, because the designers had done whatever they thought best...
Firstly, this is getting far too specific. The standards would give a suggestion for how units should be affected under the "desert sand" heading, not all the different types of sand. But this isn't a result of having standards, it would occur if the standards were not there too, but to a worse degree, because there would be no control at all.As a forinstanmce, someone may have sand in there map which looks, to most, like wet sand, due to the lighjting. But the map maker may have put it down as dry sand (which lets face it acts nothing like wet) and then, confusion follows.
As a map maker, if you change how the terrain effects units, you can't do it randomly, just as you wouldn't place the metal patches randomly. You have to visually explain to the player why this terrain is different from that, and why that terrain affects a unit differently.
If you placed wet sand next to dry sand, and they looked almost exactly the same, and there was no explanation for it (such as being next to water or something), then you aren't fulfilling your role as a consciencious map maker.