Colonists die from infection because they are tended by others with low tend quality.
It would be a major improvement if the colonist or medical tab had a quality slider
e.g. "minimum tending skill" (specifically for infections)
Players also micromanage their doctors by having bruises treated by others with low skill. It would be a similar improvement to have a slider for nonlife-threatening tending, or perhaps a button [ ] Allow lower skill for non-life threatening.