Thinking about magical healing machines

I'm not sure if I've talked about this before but: every time I encounter Magical Healing/Health machines in speculative fiction (eg the sarcophagi in Stargate, the med bay in Star Trek, the machine that turned Steve into Captain America) I think about how they decide what counts as an illness/injury, and how they decide what Ideal Healthy State to go for. The line between "sick" and "healthy" is to some extent socially mandated and arbitrary, and an optimally "healthy" human population requires variation amongst the individuals. To maximise everything is impossible. You have to make choices.
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