If ghostball sucks so badly, why is it so popular? It's easy to explain. It tells the beginner and advanced player alike where the cueball is going (tangent line). No it isn't "easy" to use. You need training, just like any applied skill, like surgery, woodworking or whatever else. It's not a skill that can be generalized to other situations, either. Just because you can imagine a somewhat accurate ghostball, it doesn't mean you can accurately put a dot on a piece of paper. It's a specialized skill and dependent on a certain talent. Some people just aren't very visual. I wouldn't call myself very visual, and I don't have all that great of a spatial awareness, but I get by with ghost ball anyway. Some probably struggle more than I do, others less.
People are talking about other aiming methods like they're totally "objective" and I'm not talking only CTE, either. Unfortunately ALL aiming systems require some training, trial and error and talent for spacial relationships. You need to be aware of where the balls edges are (unless you're Duckie). You need to accurately pick out the quarter marks on the object ball which is not at all easy to do without training, imagining sections of a ball isn't so much different than imagining a ghost ball. Visualizing a clear "dot" on a ball without markings and keeping it in focus while getting ready to shoot, without losing sight of it or "forgetting" where it is isn't easy either. Many people can't even find the center of the cueball right. Then, with most aiming systems you have to translate where a "big" ball (the cueball) hits the object ball which appears smaller, keeping in mind that the part you can't see is the one actually striking the object ball. It's kind of like backing up a car. You get a certain feeling for where the cars outer boundaries are after a while, much like the cueballs parts, but it's usually tricky to just get in a completely strange car and park it with inch precision without sensors and cameras. For contact point aimers and fractional ball cutters, the parts that you are actually "aligning" to the impact point are not on your actual cue line, but paralell to it. You see how this is similar to the car. So, no, I don't buy the premises of either CTE, fractional or contact point people about their so called "objectivity" and "guess free" operation. And I've used them all. Don't even get me started on spin.
I'm more than happy to discuss any aiming system with anyone, but lets all stop the pretense that there is a system that can be used "out of the box" by anybody and be 100% effective. There isn't and there never will be. Different systems have different strenghts and weaknesses and work for different people. They all take work, and I don't think any of them takes much less work than any other.