I don’t think you understand how difficult it is to search the amount of data that google sifts through before showing you results
How does the fact, that websites are written a certain way to please googles search engine, not apply to the fediverse? Even if all information was posted to or accessible through the fediverse, searching something will still use some kind of search engine. So people will also eventually start doing SEO, regardless if its Google’s search engine or the fediverse’s search engine that they are optimizing for.
Yes its problematic that google has a huge effect on what people see or don’t see on the internet. But that wouldnt be any better for the fediverse. Its only better right now because you know what kind of information is on here, and you are getting a kind of pre-filtered selection of knowledge because of that. You wouldn’t even start to search for washing machine repairs on here. You wouldn’t try to look for local businesses here. If literally all of these things were here, the fediverse would need to start working on their search engine to stay fast enough to be usable because its just so much data, so many possible results. That would also result in some kind of arbitrary rule set that will make your post more likely to be shown as a result. And that will cause people to optimize their posts for the search engine.