Actually, that not true at all. But having so many different maps available on official servers you would be taking the official server player base and spreading it even thinner than it already is and that would be the polar opposite of healthier. It would make the players first impression that the game is extremely dead, because the players would be spread not just over the current 3 play styles and 2 maps (not that Isle of Siptah is overly populated), but even MORE maps (and potential play styles as you suggested in the title). So in all, you would be looking at servers with what, 4-5 players active at most? It would turn new players off before they even got established.