does it really matter how you get there if your final stroke is straight? is it really important if you adjust multiple or individual parts of your body?
It depends. Playing great pool requires great consistency. A player can devote a few thousand hours to small individual adjustments/tweaks, like twisting the wrist one way or another, or whatever, and eventually they'll develop a good level of consistency doing whatever they're doing with all the pieces. But I think the road to consistency can be much shorter by focusing on less moving parts, treating the stance and stroke as one consistent piece of machinery.
With that said, the final stroke relies on the consistency of all the individual pieces. So, in order to get to that level efficiently, it makes more sense to have those pieces moving in the same consistent way as often as possible, rather than always tweaking a piece here and there with inconsistent adjustments to make it work. Repetition is the key, repeating consistent motions. It's how you develop muscle memory, and the fewer parts/pieces involved, the faster you get there.