In fact a more efficient power can be attained with a pause. We see much more golf on TV than we do pool and both back swings/stroke are to achieve only one thing which is to get the club/cue in position only.
Many players try to create a bounce using their legs, legs are were the extra force comes from, making them think they are getting more power. In fact it is the opposite because as we stroke backwards faster, the forward stroke is now fighting the backwards momentum which kills power.
Notice when a golfer on TV needs to get a 9 iron over the trees for a distance of about 180 yards. The back swing they take is slower and more deliberate. Why, because they need to get the legs, and rest of the body into a settled position for maximum torque. I also know this because in golf if I need an extra 10 or more yards out of an iron to cut a corner over the trees, my pause is longer than my normal swing. I use golf here because we can see results by the distance outcome were as in pool we do not have the tools to measure in normal play.
Look at a baseball pitcher. They also pause before they follow through on their throw. If so much power were gotten by moving faster (reducing the pause) taking the ball back, more would be doing it. How about the batter, just before the ball arrives he creates that extra coil but there is a slight pause before he swings.
Clearly, you do not want to be idle for a long period of time because of muscle locking. But the important thing here is that power shots are missed because the player was too fast and never allowed for settle time (this includes everything including aim and posture).
There are no shots in pool that require so much power that a normal back stroke with a slight pause can not handle. On the other hand, the player that does not pause long enough they are more likely to have an erratic shot because the flaws in their stroke will become more pronounced.