There are three I can think of:

1. You will not have to rely on anything but yourself. Well some of the things anyway.
2.The bowshould be quicker pointing.
3. Daylight should not become an issue as long as you can see the spot you need to hit (and follow game laws). I know of a fellow that practices in the complete dark, he uses a pen laser on the target as an aiming point. I'll have to try that some time.