Originally Posted by btaylor
It prevents the camera from autofocusing when you didn't want it to. I find that the increased flexibility makes it easier for me to achieve the critical timing necessary for fast paced wildlife photography. For example, I can take a shot, wait a half second, then take another shot, all without performing any autofocus (which might focus on the wrong thing or take too long). When the autofocus is integrated with shutter release, there is no way to snap the shot without engaging autofocus. (Which is fine if you want to autofocus every time, but many times I don't, and autofocusing again would slow me down.)
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