But they won't dig through thousands, they'll use (at least anything I've seen) will use the first 5 or 10 results. It would be prohibitively expensive to use t

But they won't dig through thousands, they'll use (at least anything I've seen) will use the first 5 or 10 results. It would be prohibitively expensive to use thousands of results. So it's still just using the underlying ranking algo.