Except that likely everyone uses some aspect of ghostball, dare I say, including yourself. The alternatives are enough to give Rube Goldberg a headache.....
Some people labor for years "trying" to see {a ghost ball} or a contact point on the cue ball (then try to hit the "contact point" with a cue ball "contact point" - talk about challenging:frown.
This is a fruitless pursuit and will lead to many frustrating hours at the table.
...
Without it, you need a unique set up/procedure not only for each cut angle at some particular CB-OB separation, but an adjusted set of procedures for each different CB-OB separation. And you can't call upon whatever intuitions you have about colliding spheres as a guide. If you're using deflection to create the angle, in addition you'd have to retool the entire set should you happen on a cue with a different characteristic.
You could pull it off if you're a real memory champ, of course. But, to my awareness, no advocate of these supposed ghostball-less systems, CTE for another example, has indicated that they're aware of the amount of memorization involved, or even what it is they have to memorize (i.e., what has to change from shot to shot). This suggests very strongly that they're reverting to their old ghostball-based system to obtain the final aim line.
The advantages of ghostball-based aiming are 1) you had a rough idea of how to do it the first time you picked up a cue, and 2) it only requires one picture in your mind per cut angle, regardless of CB-OB separation.
Jim