This is fascinating to me, as I basically never go to a restaurant without a booking.

But I think you're underestimating this use case, as the data you linked shows that Google is the top referral used by people to find the restaurant/booking website, and once SEO is overtaken by ChatGPT-like experiences it would make sense that "book this for me" would be a one-click (or one-word) logical next step that Google never had.