..... This game has so many nuances. I can only work on a few things at a time and I consider stance, alignment, cueing straight, and timing foundational.
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I agree absolutely!
Most players (myself included) first start playing this game in wide-open mode, meaning we take our weak and inconsistent mechanics to the table and start hitting balls. We miss plenty more than we make, and we think it's because of poor aiming skills. After a few hundred or thousand hours at the table, some of us become pretty consistent.
Too many people think consistency in pocketing balls is the result of developing good aiming skills over time. But, actually, what leads to solid aiming skills is the development of consistent body mechanics - stance, stroke, cue delivery. These things allow us to accurately and consistently send the cb to where it needs to go, and that's when aiming skills really start to develop.
So I believe the way you're approaching this is excellent.