I think what scares me about Kagi is the privacy aspect. One thing to look up "hot steamy decompiler software in my area" in an incognito tab (even if it's not particularly that private) and another to do that logged in to a service linked to your credit card linked to you through all the KYC.
And for all practical purposes, switching to an incognito tab is pointless against Google. If there are 99 searches from IP 1.2.3.4 using Firefox version 123.4 with Google cookies, and now 1 search from IP 1.2.3.4 using Firefox version 123.4 without Google cookies is practially "good enough" to assume it's still the same person.
Anyway, I'm also sold on Kagi, and DuckDuckGo before that. I didn't even know Google had broken quote searches, but I'm not too surprised.
But ISP dangers are at least mitigated by HTTPS/proxies/VPNs/public Wi-Fi/Tor. Does Kagi have any comparable protections? It would actually be extremely cool if it did.