Turn off Your Brain!
A good release, with fingers or a mechanical device, is entirely subconscious. While you begin the shot consciously, the rest of the shot should be carried off without conscious thought. Good form demands that you NOT KNOW when the arrow is going to be sent on its way after you decide to shoot. You should be surprised when the bow fires.
If a little voice in your head is telling you NOW!signaling you to pull the trigger or let go of the string then there’s no way you can be surprised. And if you’re not surprised, then your form stands a good chance of being off….which means inconsistent shooting. Granted, there are times while hunting when you must shoot at a specific point in time, but this should be a rare occurrence.