I'm not sure which parts you're talking about, but some things we've said are gospel. In particular, except for a very narrow selection of shots that just happen to balance squirt and swerve just right, "mechanical" adjustments for squirt (like BHE) cannot be accurate without some "guesswork" adjustment. This is a given that's independent of the player's skills - the only thing that's open to question is how the "guesswork" adjustment is made and which method is best for the individual player.
Another thing that's gospel is that some ways of aiming or stroking are inherently (independent of the player's general skill level) more consistent and accurate than others. In particular, it's inherently more accurate and consistent to stroke the cue in a direct line toward the point you want to hit on the CB (a "simple" stroke), rather than trying to hit the CB contact point by stroking forward and sideways at the same time (a "compound" stroke), timing the curve perfectly so that the tip's forward motion and its sideways motion intersect at the CB contact point.
Let me emphasize again that I'm not (and I don't think Dave is) saying one method is better than another for everybody. But these inherent additional challenges are independent of the player's general skill - one player may be better at dealing with them than another, they may even be smaller difficulties than the alternatives for some players, but they're "built-in" to the techniques so nobody can simply avoid them, and every player should benefit from knowing about them and making informed choices with them in mind.
