And how exactly do you think google maps finds the results? If you think the search on google maps does not use a search engine, you have a lot to learn before having this discussion. Google maps is pretty much just a different interface for showing you results from the same, or at least extremely similar search engine as regular google uses
I agree its better to have several different options to pick from, monopolies are never a good thing. But that just means we don't want google to have a monopoly. It does not mean that we want search engines to be gone.
You are mixing things up that have nothing to do with each other. How is the fact that Facebook does not interact with old forums an argument for not having search engine services like google, duvkduckgo or bing? The federation in the fediverse definitely is nice and I hope it becomes the standard, but I really don't see how that would mean that we don't need search engine services anymore.