I agree. It seems that a lot of people think ONE approach fits everyone and that is not the case. Pool can be as simple or complicated as one makes it. It is up to the individual to "understand" what works best for THEM.
There are only two things to accomplish in any pool shot. Put the object ball where you intend it to go and put the cue ball where you need it to be. If you can do that, it doesn't matter what cue, what stroke, what tip, or what method you use.
Knowledge and experience is the teacher and sometimes one comes before the other.
I don't want you to feel I'm picking on your statements, because I'm not. What you have written that I highlighted in red.... I feel too many make the mistake of taking that statement as all you need. I feel that it goes much beyond that.
It takes not only that, but being able to do it repeatedly. Many feel that just because the ball went in, and they got good enough shape to make the next ball, that all is fine. But, what they may have failed to see is that they barely made the ball, and their position play should have been much better.
It wasn't fine, because either they chose wrong, or they executed wrong. The game takes top precision to be repeatable. One should always be looking at what part of the pocket they wanted the ball to go in, and if it actually went in there, or they were off a little. If they don't know if they were off a little, it's just a matter of time before they are off enough to miss the ball. Same goes with position play.