You can read their blog about the AI-crap, in terms of their approach and philosophy. In general, it is optional and not part of the major experience.

The main reason I use kagi is immediately obvious from doing seaches. I convinced my wife to switch to it when she ask, "ok but what results does it show when I search sailor moon?" and she saw the first page (fan sites, official merch, fun shit she had forgotten about for years).

What you need to know is that you pay money, and they have to give you results that you like. It's a whole different world.