I admire and applaud Kagi for what they are trying to be. But on the AI front, the Assistant is simply worse than using for example Gemini or ChatGPT directly. It is slower, it cannot generate images etc.
On the other hand, it doesn't monetize any of the data you give. Six of one, half dozen of the other, yeah? Re: image gen... it's a search engine. Why would I need my refrigerator to toast my bread?
So to answer your question, while charts might not be particularly useful for a search engine a tutor certainly benefits from them.