I’ll chime in and say that I spent a day in a half looking up a weird Python library issue on DDG and Google and had no luck without searching the exact error message and looking at like 7 different results.
To test Kagi I searched using the vague search term I initially started my round of hunting on the other engines. The stack overflow page with the answer was the first result. I know it’s not a perfect test, but in my few days with it, I’ve had FAR more luck finding things in any topic compared to other search engines.