I practice karate and have for 40 years. I've taught it for over 26. I try to apply my focus when I shoot pool:
When I am down on the shot, I focus on the path of the breath, just the path in and then out and I shoot on the out.
I completely understand your point. But I watch pool to get better, and seeing a "flow" player doesn't help me at all. I gain far more for my own improvement by seeing a player figure it out. Seeing them point to where they want the cue, or the object ball, to go during a safe is far more...
Big factor for me is the feel of the shaft. I tried carbon shafts, and even those with a low deflection reputation. I can't get used to the feel of the shaft when it's not wood. Using a lower-deflection wood shaft now, and it's perfect.