"Plus, you're underestimating the percentage of queries that google has never seen before."
No. I am highlighting that 75% are queries that they have seen before. Note also that the 15% is a figure that is declining, based on what it was in 2007.
Plus, you're underestimating the percentage of queries that google has never seen before. Google processes trillions of searches every year, and still, 15% of those queries have never been seen by Google before. [0]
[0] https://searchengineland.com/google-reaffirms-15-searches-ne...