Here's a relevant example: https://news.ycombinator.com/item?id=44142113
It's one of the few AI features, despite still being shoved in my face, that I actually find useful.
With that said, the worst thing is how search results have degraded significantly since the AI years, even before they added the actual "AI mode."
Google now (and quite a few search features on other services, e.g., Twitter) often returns results that have ZERO relationship to the search keywords I gave -- like an entirely different person when searching for a person's name, which I think should never happen and did not happen when search was still based on a "rigid" algorithm of indexed content. So, I can only assume it's because they have some AI thingy along the process.