Dr. Mew has mentioned in a video that he can tell those who've had orthodontic treatment on both the upper and lower arches at the same time from those who haven't by feeling the lack of power in their masseter muscles when they bite down, because the teeth have been prevented from making natural micro-adjustments and as a result, the artificially created (though correct-looking) occlusion cannot load weight symmetrically, and the body won't let you bite with full force. Is that plausible? @Progress has stated elsewhere that chewing in and of itself does not move teeth too much, because that would defeat the utility of teeth, but that it may upright them over time, given correct oral posture. (Did I understand you right?)

I am getting braces placed in a few weeks to start to bring my teeth back into occlusion after a fantastic MSE expansion, and I'm wondering if it would be smart to insist that only the upper arch gets moved first. Could vigorous and tough chewing effect the same micro-adjustments later on, even if my bite, once finished treatment, won't let me load as much force as it ought to? I remember an orthodontist in France once told me that they as a general rule never place braces on both arches at the same time, but I didn't think to ask why at the time. (The French do tend to have much more robust masseter muscles than Americans, though they also have much less CFD as a whole and I believe orthodontic treatment is much less commonly done.)