I had a similar experience when testing Kagi after reading this. The top result for the “wider car tires” query on Kagi was a link to Physics StackExchange with some marginally informative answers [0], which would be easy to expand on in future searches. The second result was Reddit. Then a couple of incorrect/irrelevant pages but they don’t look like scams

[0]: https://physics.stackexchange.com/questions/29903/why-do-peo...

Edit: I did just realize that I have StackExchange customized to be up-ranked. So that probably helps. But yeah, I guess this is why I usually get good results, which is something that generally still fails with Google for me.