Not all of us put aiming ahead of cueing. But obviously the aiming systems have gained a lot of press over the last decade, probably mostly due to widespread discussions made possible by forums such as these. Prior to that it was just a select few that knew and shared the details.
As for good cueing - fundamentals haven't changed much in probably 50 years. Certain things have to be in certain places to facilitate a straight stroke, the mechanics are actually pretty simple, and we have slight variations based on body type, arm length, personal style, etc. And of course country ("snooker" style stance vs "American" style stance"), game (more upright for some games, closer to the cue for others).
I for one study a lot of the snooker players and teachers as I think fundamentals are extremely important, I work on them all the time and have even adapted some snooker-style traits into my game.
Aiming is equally important. If you want to utilize ghost ball, back of ball, etc., or use a system, whatever works for you to get on the right shot line is fine by me. I have found through study and experimentation that the systems do work and can provide an advantage, but to each his or her own.
Scott