Actually if you try using rand() for map or noise generation, you'll find that most implementations of it produce utter shit. It's not even random looking. It

Actually if you try using rand() for map or noise generation, you'll find that most implementations of it produce utter shit. It's not even random looking. It produces very obvious patterns. Really, it's shit. So despite that it could still be useful in some situations, but I don't think that's good enough reason to require its existence in standards and standard libraries. If your application happens to need something that carries a remote resembleness to randomness, and it needs to be fast, your application could just provide its own implementation of that special functionality. rand is just a few lines of code...