It’s normally called a “back-tension release”, and it is typically only used in competition shooting with fixed targets. You would never use one hunting because sometimes you have to keep the bow at full draw for a period of time while you find the best shot or wait for other factors. As an archer you aren’t thinking about the tension on the string but instead the tension on your shoulder blades as you bring them together during your shot cycle. Focusing on your body during your shot cycle is what can lead to the “surprise shot”. But yes you still have a general understanding of when the bow will fire, though since there is not a trigger it is highly unlikely for you the “punch” the trigger or push/pull the bow out of alignment with your shot cycle.