They’re absolutely relevant when you’re talking about building a user interface for billions of people. You could put a domestic abuse warning on every single search result page, or you could put it on no pages, or you could put it on a subset of all results; and when you’re already putting it on a subset of all results, you’re making a decision as to which queries to exclude it from, which means you need statistics to decide which pages need it the most.
They’re absolutely relevant when you’re talking about building a user interface for billions of people. You could put a domestic abuse warning on every single search result page, or you could put it on no pages, or you could put it on a subset of all results; and when you’re already putting it on a subset of all results, you’re making a decision as to which queries to exclude it from, which means you need statistics to decide which pages need it the most.