Why can’t they work that efficiently every shift? The answer’s obvious if you’ve covered for a sick coworker at a fast-paced job—because you’re stuck in the weeds the entire day, and just because you can put up with a miserable day once in a while doesn’t mean that the weeds are a sustainable place to live. From a boss’s point of view, though, the weeds are where workers should be—at maximum productivity, all day, every day.