I mean, that’s because googles AI over view is designed to summarize search results on a topic. On one hand that reduces the degree to which it will simply hallucinate, on the other sometimes the top search result is already as concise as it can be at the target grade level of writing.
The only times I’ve had it be remotely helpful is when you want something specific that’s going to appear near the top of search results and is also likely to be buried in a bunch of irrelevant faff. Which is to say that occasionally “search for X and summarize the top result” is a useful tool but not often enough for them to front and center it like they do.
For example recipes. You can’t copyright a recipe, so recipes tend to be buried in a lot of crap that isn’t the actual recipe.