Because it'0s missing one of the most important option - landmass shape and/or water/ocean frequency.
I detect maps that are basicly tiny islands or strethched patches of land. No where to go, so restricted. And yet the game LOVES to generate tons and tons of large lakes everywhere.
Now I have a problem with that, because I'm the kind of player that will re-start the game 1000000 times until he gets the exact conditions he wants. Its' frustrating as hell, but I can't help it. Like the most annoying itch in the world, I have to scratch it.
I just spent 1 hour just re-starting game after game. It's driving me berserk.