Your buyers moved to answers. Your reporting didn’t.
A rank tracker can tell you where a page sits on a results page. It cannot tell you whether ChatGPT named you, named a competitor, or named nobody at all — and that conversation is now happening thousands of times a day without a single line in anyone’s analytics.
The uncomfortable part is that the answer changes. Ask the same question twice and the assistant may name a different set of brands. Anything that treats one answer as the truth is selling confidence, not measurement.