Some people believe a passive / cosmetic arm serves, practically speaking, "nothing".
That would then be a mistake.
Typing, for example, can go on all day like this with a perfect shoulder, back, neck and arm posture.
Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Hot summer - Wolf's new cosmetic arm - typing on a computer keyboard; published July 26, 2010, 01:02; URL: https://www.swisswuff.ch/tech/?p=341.
BibTeX: @MISC{schweitzer_wolf_1594297489, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Hot summer - Wolf's new cosmetic arm - typing on a computer keyboard}}, month = {July},year = {2010}, url = {https://www.swisswuff.ch/tech/?p=341}}