Any talk of lag, plane, wrist cock, whatever is voodoo. It does not work, never did. You can't teach a student all this.
Paul Bertholy proved this statement to be incorrect with thousands of students (not counting those he taught indirectly through instructors that learned from him) and that is not only the 'truth' it is a fact. As some have said 'You are entitled to your own opinion ('truth') but you are not entitled to your own facts.'