You can turn off spell correction if you don't like it. If you do like it, it's going to change what you type occasionally by definition.

I also feel like it could be better, but this thread seems a little over the top. Censorship because it avoids autocompleting things that might embarrass you?? And as was just posted a couple days ago, if you intentionally use words and phrases, it will learn that you do and will go ahead and suggest them https://helgesver.re/articles/macos-vulgar-word-flags .