To be honest, I didn't find DuckDuckGo's AI on the top of their search to be very good anyway compared to the one Google has. However can't say I have cared much as typically if I am searching I don't want an AI response, otherwise I'd just go straight to an AI chat interface in the first place.
Biggest problem is that google has a near exclusive deal with reddit, so all other search engines have old reddit results [1]. [1] https://news.ycombinator.com/item?id=41057033
Unfortunately I have seen far too many people, especially less tech savvy ones rely pretty heavily on the AI summaries provided by the search engines. And I think it can be a bit dangerous to have these results be super unreliable in what they state. The Google one also isn't perfect, but I've at least found it's a bit more accurate. However I personally don't really care for either. As I mentioned in my OP if I already made the choice to use a search engine, it's likely because I don't care for an AI response as I could open up Claude/ChatGPT or whatever's interface and ask the question there if I just wanted AI.