I've never understood why people have this viewpoint. If there is no preference for one property of a work (ie. lighting) to match reality just because another unrelated property (biology) doesn't, then surely the only possible scenarios remaining are an exact replica of the real world (where all properties match the real world) or an entirely arbitrary construction (where no properties should match reality). Fiction is predicated on the idea of "reality, but...". Saying that any single difference from reality should lead you to expect no similarities to reality at all, if followed, would collapse all fictions into pure arbitrary soup.