They show all enemies on the map??? But…why?

I'm all in favor of pausable real-time though, I think Fallout:tactics had some of the best combat I've seen in a tactical semi-RPG. I also love the infinity engine games, all real-time with pause, and actually even got quite a lot of enjoyment out of the later UFO installments (Aftermath, Afterlight, Cybershock).

But, back to the more important question. All enemies on the map??? But…why?