I think tonzilla has a point here. (although I don't think it is a fact that Nicklaus has the "same" ball position. I think he has the ball equal distance to one foot and then change the other foot spacing according to clubs)
The knowledge from the D plane understanding is "a" if not "the" crucial part of understanding the science behind ball flight making. Trackman and its use can help many folks to turn on the switch so to speak so that they don't have to search and experiment in the dark. Its value is undeniable.
Yet, for some people, they may feel bogged down with this load of info.
Rarely do we come across folks with no swing faults, and I mean those faults that even trackman aided teaching may not be able to correct immediately. (don't ask me why,,you folks are the teachers
Because of this reality of the abundance of imperfect golfers, extra mental load may liberate some but complicate the execution of a golf swing for others. Some people need simpler or no swing thoughts, that is all.
Similarly, perhaps some enjoy thinking of how many inches outside the cup to aim for a putt; others go with a feel and if that feel is disrupted by science, the outcome may be worse.
In other words, knowing more allows some to know more but does not necessarily lead to a better golfer.