The issue is the premise that there can be a good or bad posture. The studies you have citied do not support the idea an ideal posture exists. Some of the studies you linked show "posture correction" exercises help with pain in the short term, but posture itself doesn't change. Exercise and validation are powerful tools. Furthermore, chiropractic adjustments have are short-term effects only, mostly placebo. Results on an x-ray can change depending on whether the patient was inhaling or exhaling when the image was taken.

I appreciate you bringing studies, but many are case reports which cannot demonstrated causation. This study (https://www.sciencedirect.com/science/article/abs/pii/S002192901930524X) is a systematic review of systematic reviews. It assessed the literature as a whole and found no causal relationships, only associations.