Having difFerEnt maps for models greatly increases level of detail without sucking to much on your FPS. I think the point is to have more visual enjoyment. surely gameplay is most important, but graphics is also needed. tesselation, well, idk, and idc, there are almost no cards supporting it i think, but i have seen the differences it makes, trust me it is huge. though it is most for fps gfx, RTS might also have it, like when you zoom a little more into the units. and stuf..yeah.