1) There are thousands of nerves that need to be connected just to use an arm. That is a lot of work, and even if you took on such a massive feat, they still may never work properly.
2) Would you wanna be on immunosuppressants for the rest of your life just to have an arm or leg that you may never have full use of? It’s not likely to increase quality of life in most cases, and the costs & risks of the surgery are just not worth the gain.
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