If you "suck at execution", or "misjudge spin effect", or "miscue", then you surely haven't mastered the art of aiming. Mastering any art involves mastering every element that comprises that art. A grand master chess player doesn't master the game of chess without mastering every piece in every possible position. A worldclass master violinist doesn't master the violin until every motion of the arms, fingers, and bow is mastered, and the feel of the chin rest, the strings and the fingerboard is mastered. Only then can they play at a master level.
Pool should be no different. Treated like an art, aiming is comprised of more elements than simply knowing where the cb needs to be. Mastering aiming involves mastering mental focus, spin, throw, squirt, speed, feel, cb hit, etc...
You believe it's impossible to master these things. I disagree. The potential of human capability when it comes to developing talent and skill is quite amazing. Athletes today compete at levels thought impossible a few decades ago. There have been great advancements in the understanding of how we learn complicated skills, and how those skills become ingrained/automatic after enough quality practice/experience.
There are pro pool players who rarely miss shots. I'm talking about missing 1 open shot for every hundred or so. I'd call that a mastery level of pocketing balls.
Anyway, most people aren't as stupid as you think. I mean, "Master the art of aiming and never miss another ball" is a real possibility for those who set that as a goal, and it doesn't mean the same to you as it does to me or perhaps to someone else. Most players would love to play for several hours without missing any shots. This is quite possible in competition if you know your current limitations and play within the realm of shots you've already mastered, never shooting a shot you aren't 100% confident with. Shoot the shots you know, the shots you've learned, and practice what you want to learn.
It all goes to definition. Aiming is not monolithic. It is not singular. Aiming is ubiquitous.
What's really wonderful about this whole mess is that aiming doesn't have to be perfect. Why, you ask? Because in pool, all you have to do is win and if you're perfect, you'll scare off all the suckers. Oh, yeah, who are the suckers? They're the dudes crowing about CTE.