I guess it's technically cool, but one should be aware that there is no such thing as "good posture" or no accepted definition that lends itself to good science.
slouching isnt bad, remaining in the same posture for a long time is, or at least it can lead to discomfort. people that sit up straight all the time still get back pain. i slouch all the time and i don't. The popular attachment to specific configurationa of your joints that look aeathetically acceptable os orthorexia, not science.
Adhesions are not really a thing as far as i know. Biggest priority is strength and cardiovascular training and maintaining a good body composition and stress level. Then I'd think about stretching.
I spend most of my time at work on a medicine ball switching between switching, kneeling and standing. At home I switch between reclined, semi-reclined, upright and standing. I think its been working great.
Does it? I think strength may be related to pain if you're very weak, and statistically there are big confounders (i.e. people who are weak also have other conditions that exacerbate pain experience). But past a certain point I don't think the evidence suggests that strength itself is protective. Otherwise, competitive lifters would never experience back pain for instance, but they still do. Pain is multifactorial, and strength is not the only determinant by far.
Never said it’s the only factor, and we shouldn’t assume all pain is the same pain
The type of pain people weight train suffer tends to be related to muscle or tendon damage. The type of pain that comes from sedentarism tends to be related to overworked (weak) muscles and bad circulation.
