I just cancelled my Kagi subscription over the weekend. Some of the ideas in the article resonate (the dev team seems spread way too thin) but I also decided that the main product just wasn't distinct enough. The lens and quick answers features were nice, but otherwise the search results were not that different from Google's -- Having just switched back, I haven't noticed a significant difference.
I also think this product might be a bit too late. GPT4 has been out for over a year now, and it's changed how I look for answers. I tried FastGPT but like the author I found it lacking. As it stands, Perplexity feels more like the future of search than Kagi.