Do you have an example of a search you've done where the results were much better from Google Search than from DuckDuckGo?
Due to the very topic this HN post is about, I don't think this is a good method - your results might be vastly different from mine.
But let's look at the number of relevant results among the top 5 results for some thing I recently wanted to learn about.
"Comprehension categories" - a rather specific term from category theory
https://www.google.com/search?q=comprehension+category https://duckduckgo.com/?q=comprehension+category
Google: 5/5 (for me) DuckDuckGo: 1/5 (for me)
"comprehension categories category theory" 5/5
I'd hardly say it's 2 to 10 minutes extra work, especially for such an obvious example
Here you go: https://imgur.com/a/CssDXS3
As a dev, I google a lot to figure out how to do X.
My experience with DuckDuckGo was that it added 2-10 minutes of filtering for usable results every time.