I don't think it does unless you reach some odd answers. The answer could be "to create a world that feels real and inclusive." A big part of world building is describing places and characters so those descriptions do matter and are not just made for no reason. I don't need to justify some convoluted way that a healing spell doesn't work.

I think we agree though (?), because if a player asked me so bluntly it would probably require a pause to talk it out at the least, and tbh that's on me for trying to be pithy rather than adding a sentence to clarify.