Search is about what the engine misses, not what it hits. If Google hits 99% and Bing 98%, in some sense, Google is twice as good. You wouldn't call 98% site

Search is about what the engine misses, not what it hits. If Google hits 99% and Bing 98%, in some sense, Google is twice as good. You wouldn't call 98% site uptime "basically 100%."