You don't need the analogy. If you have a tool that does a job for you your capacity to do the job degrades alongside other associated skills.

Tools that do many things and tools that do a small number of things are still tools.

> "do we really even need a body at all anymore?"

It's a legitimate question. What's so special about the body and why do we need to have one? Would life be better or worse without bodies?

Deep down I think everyone's answer has more to do with spirituality than anything else. There isn't a single objectively correct response.