No, it doesn't mean that 99% of the time. It's more like 99% contextual. If I ask for recent wildfire news and I'm in a state that doesn't experience wildfires

No, it doesn't mean that 99% of the time. It's more like 99% contextual. If I ask for recent wildfire news and I'm in a state that doesn't experience wildfires often, are you going to return 15 news articles about wildfires spread out over the 200 year history of the state? I almost certainly want 15 news articles about the current wildfires in some other parts of the country. Your algorithm doesn't really say what to do here. If I ask for "recent relatively rare astronomical event" recent might mean hundreds of years or more. If I ask for "recent PC game releases" it might mean a month or the current year. If I ask for "recent public events in my town" it might mean over the last week. In many cases, "there are no recent events" is a better answer than "here are the last 15 events."