Why is green such an underutilized color?

I've been designing pretty advanced MOCs for years, and one trend I have noticed over time is that original green - despite being one of Lego's earliest colors - is actually very difficult to accommodate in MOCs. As an example, I design a lot of steam locomotives, and those - by nature - use a great deal of curved slopes. And if the locomotive I am modeling is green (and so many of them [especially European ones] are), I always have to pause at the outset and ask "do I really want to do this...