Earlier quoted context omitted.
> If you are going to rely on domain-level reputation then your search engine is going to be way behind the search engines that can judge content more specifically, which is all of the other search engines. Then why do Google and DuckDuckGo return 90% garbage for most queries? "All of the other search engines" have completely failed to keep pages from the results that are not only low-quality, but outright spam.
They definitely do not return "90% garbage for most queries". This 8s an unsubstantiated claim I see often i HN and honestly not backed by any real data. e.g. You can check your search history and see it yourself.
Instead, the top result was W3Schools. Then came the Python docs, then 5 pages somewhere between blogspam and poor-quality tutorials. Then a ReadTheDocs page dating to 2015. And that was it. No more official Python resources, no StackOverflow. In the middle of the results some worthless "Google Q&A" dropdowns that lead to more garbage quality content.
So for this query, using my definition of "garbage", the "garbage percentage" is somewhere between 80% and 90+%, depending on how many Q&A dropdowns you waste your time opening.