In his book, he does. Mark Wilson's mantra is that you can swing a cue any haphazard way you want, and with enough practice you can become a World Champion, but if you incorporate a pause in your stroke, as well as his other guidance on stance, etc, you can develop a rock solid, pressure resistant stroke sooner than the haphazard guy.
I suspect that when an instructor demonstrates the pause, they are showing you that the back stroke has nothing to do with the cue speed on the forward stroke. As a result, they are trying to teach you that there is no reason to take the cue back fast and rush into the forward stroke. Instead, you pause between the back stroke and forward stroke in order to divide the back stroke and forward stroke into two distinct parts, which helps you not rush your swing, which presumably will increase your cue ball striking precision. And CB striking precision is not simply measured by: Did you miscue or not? Rather, cue ball striking precision is measured by: "Did you hit the CB within 1 millimeter of your aim point?" Unless you are a pro, the answer is most likely: "No!" When you realize how precise your cuing needs to be, you might come to understand that a quick backstroke with no pause before the forward stroke inevitably leads to some slight tremor in the transition between the back stroke and the forward stroke, which will prevent you from hitting your 1mm radius target circle.
Because the back stroke does not affect the speed of the cue on the forward stroke, you might as well take the cue back slowly and precisely. The purpose of the backstroke is to groove the correct take back distance--the distance which will enable the forward stroke to achieve the necessary speed at cue ball impact for that particular shot. A quick backstroke does not somehow build up energy in the cue for your forward stroke to launch off of like a spring.
To summarize, I think a pause is supposed to help your CB striking accuracy by smoothing out the transition from the back swing to the forward swing, which will allow your cue to stay on line with the chosen target point on the CB.
I think I could easily hit a 1mm radius circle drawn on the CB if I very slowly inched the cue towards the CB on the forward swing. When I got within an inch of the CB, the cue would be moving so slowly I could adjust to precisely hit the target. However, that is not enough speed to hit any shots, so I have to speed up my forward swing to actually play pool. But, as I speed up my forward swing, I get more inaccurate, and at some speed in my forward swing I can't hit the 1mm circle anymore. So the question is, "Does a pause before my forward swing help me more accurately hit that 1mm circle?" You'll have to answer that question for yourself. I bought a practice CB with a bunch of 1mm radius circles stamped on it, and they are extremely hard to hit! It makes me appreciate how smooth and on line your forward swing has to be in order to even get close.