I personally have not found Kagi’s default search results to be all that impressive, contrary to what most users seem to feel. I don’t know. When ddg and Google fail me, I will try Kagi and I think maybe only once or twice has it actually made finding what I’m looking for any easier.
I will mention though, you can do a lot of personalization on the results unlike other engines. So maybe if I took the time to customize, I might feel differently.