I don't know if you just aren't really following the conversation, and thereby just responding to individual statements, or if you are deliberately trying to confuse things for others. ??
We are talking about AIMING here. So, let's keep it in context.
1. Aiming with ghost ball- this means that you aren't using contact points, but you are estimating where the center of the cb has to be when the cb makes contact with the ob, then you shoot down the line of center cb to center ghost ball.
This has been shown and proven that very, very, very few people are actually able to do this accurately. When given an easy test, which simply is for the shooter to get behind the cue ball, while the assistant marks where the shooter says the ghost ball line is, the shooter is almost always wrong.
2. Since the discussion is about aiming, and aiming is about finding the line to shoot down, aiming systems (or methods, depending on how anal one is with wording) naturally do not cover playing position. Now, I was wrong when I included jump shots, that is a normal aiming shot, just elevated. The others, I was right on. Ghost ball does not show you how to aim a bank shot. Nor, does it show you where to hit the rail to aim a kick shot. One can use ghost ball to shoot into a certain spot on the rail for a bank, or a kick, but ghost ball does not show one exactly where to put the ghost ball in those shots. Either one uses another system to find that spot on the rail, or they are just estimating where to hit. If an aiming system doesn't even tell you where to find the shot line, is it even really an aiming system at all?
3. Ghost ball is usually the first term someone hears in aiming, and often is the only term they learn. So, when asked how they aim, most will say "ghost ball". Ghost ball is great for teaching. It is great for diagrams. In teaching, it is often used to show where the shooter needs to shoot the cb to. However, ghost ball aiming in itself does not show the shooter where that line is unless one is able to very accurately picture the ghost ball in their mind on just where the want it to be. Very few are able to do that accurately.