Personally, I don't think any of us know enough about the mechanics of pool to discount ANYTHING that the pros do including elbow alignment, elbow drop, wrist twist, stroke swiping, elevated cue etc.
There are instructors who continue to probe the whys and the wherefores of unique playing styles, stances, grips, wrist lock, wrist loose, elbow drop etc. It may be safe to say that some people might be better off staying with a canned program but I believe that we are all individuals and some of these idiosycracies have GREAT VALUE for those who find they have a need to use them. The canned approach to teaching pool is a good place to start but you shouldn't stop learning there.
One thing that instructors have a tendency to teach that irks the hell out of me is that they teach that you should always have the same number of warm up strokes for every shot. That's just not the case for MANY, MANY, MANY TOP PLAYERS and even myself.
Things vary from one person to the other. I suggest that you experiment and see if any of these idiosyncracies can help your game. If they don't, put it on the side. Who knows, maybe one day that bit of information will help your game.