Who ever said it would? Or that you don't need those other items? You also left out kicking (why didn't you knock lil Joe kicking systems?), banking (didn't see you knocking Freddies systems, or the systems Brumback uses), speed control, safety play, ect.
By the way, I always loved playing those guys with a lot of heart that couldn't make the ball! They never knew when to quit!
Did you not see "Any other system" in my post.
Many CTE defenders are just too thin skinned IMO When they see a perceived knock against their Holy Grail.
If it works for you, great. I have been a pretty good player for 50+ years without it.
Let's play a little one pocket sometime and see who quits.
I will be in Las Vegas in May. Bet what you want.