jcl said that they did not implement model instancing because it only had a positive effect in a few cases (said to be unrealistic/ uncommon cases - I disagree) and a slightly negative effect on the framerate otherwise. A few years later I proposed to have model instancing implemented but only on selected models, i.e. user defined (rendering) behavior. jcl agreed but only for a/ the next renderer, A9 (should it ever come) to be precise.