Comment by SEMW

This is a good argument, but it has a flaw here, which is that a systemic fever during illness may still be an evolutionarily beneficial adaption on average if there are a some situations where it can be the difference between life and death, e.g. bacterial pneumonia or sepsis, but that doesn't mean it's equally useful for all types of illness.

I did a fevered research dive last time I had the flu and came to the conclusion that there wasn't really any good evidence that fever is helpful for flu, and I should have few compunctions about suppressing it. (And that most of the situations where fever is really valuable for are ones where in the modern world you should go to a hospital and in the case of a bacterial infection be given antibiotics)