I never thought about this. If you are not camping, it would be pretty annoying for people to automatically know where you are. This would be a tough decision. I guess in Halo: Reach, when you get killed, your spawn camera slowly rotates into the direction your killer is, even though it doesn't clearly show the exact location. All you have to do is search around as your spawning, and see if you can find him. If it is as simple as that, why not add killcams? It will just be more simple. Getting 1-2 kills and having someone be clear of your location is better than 4-5 deaths before you find your killer.