This makes sense. I'm assuming that, for the AI search assistant, Google has worked plenty to refine data lookup and retrieval—they definitely have some internal tech that competitors don't.
https://en.wikipedia.org/wiki/Tf%E2%80%93idf
Take it from me, this'll be all the rage next year.
"Save token spend by optimizing your agents' grepping spree!"
So this is why Google is considered so far ahead of its competitors in the AI race!! (lol)