Actually, as a BCA instructor, I endorse learining by systems but, as I mentioned above, I don't encourage using them in play.
Your argument here is a logical fallacy. You assume that if you take time off from pool, you will perfectly remember how your "system" works, but that you will have no "feel." In fact the opposite is most likely true - players that take time off develop their feel much faster and would have to relearn a system.
Lastly, without "feel" you can't excel at any pocket billiards sport, since you must be able to "feel" where to hit the cue ball, how hard to hit it, and where to hit the object ball in order to run out consistently. No "system" - or pool school on systems - will do that.
-td
PS: as an experiment, if you come to Texas, we can see who get's 3 fouled first, you can use any system you can "remember" while playing

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You just lowered my opinion of instructors ( if that is what you actually are), if that is your theory. How can a person that takes their time off improve their "feel"? Feel is derived by practice, not taking time off! Systems do not change. They are improved on
by feel! When you use a system to get postion, granted, you have to expand on that system and practice and "feel" will be two of the factors that will get you there.
Age, eye sight, lack of practice will affect the game and throw your game off. Systerms do not change. And are not fogotten as quickly as feel is.
The systems that you were talking about was directed at "position play" not aiming. So don't bring that into play here. I am not arguing that point.
How would you have to re-learn a system that is memorized?
I think you are confusing systems for position play as you originally requested with people who have natural ability. My daughter has natural ability and doesn't need any systems. My wife doesn't have that ability. My daughter doesn't use any systems, but, could probably improve her game 10% to 15% if she did. You can train all the people that you want, but, their game will not excell without ability. Systems or not.
Bob Jewett is incorrect also. I use several systems all the time for postion play or breaking out clusters, so whether it is a factor in your game or not, it is one in mine.
And why do I have to come to Texas, you can come to the Midwest, or I can see you at the next BCA tournament in Vegas. Just remember the old adage, those who cannot do, teach.