I don't think you understand the goal of a hackathon. They aren't (or weren't) VC pitch sessions.
You don't run marathons to be usane bolt, you don't go to hackathons to land VC deals.
24 hours of non stop AI usage doesn't sound fun. It sounds hateful and demotivating, you want to discover yourself, and maybe some other people, not what a robot can do.
I've found most hackathons not personally fulfilling because you can only get small stuff done and finalize maybe a happy path or two, accompanied by some rushed slides, before you run out of time. The AI really changes this and you can actually deeply exhaust an idea.
In the end you will just be doing stuff with a robot anyway.
I think it's you who has a very narrow vision of what a hackathon can be. Hackathons can both be about developing your programming skills or coming up with, then presenting new and interesting ideas.
In a sense, the latter is kind of about "landing VC deals", but replace VC with possibly a different audience.
I think this narrowness of mindset is more notable in the last paragraph: "...you want to discover yourself, and maybe some other people, not what a robot can do." In my perspective, what I think OP is saying, and I can personally see, is not about what a robot can do (at least no more than when experimenting with a different language/framework/library/etc.), but how far can you shape and accomplish your idea into reality using AI.
The problem is my friend you're right but people who tend to browse this website are no longer engineers who would also understand this; it's mostly HR, Managerial staff, and jaded engineers who never enjoyed implementation details, and who are presently trying to convince everyone else implementation details are no longer of relevance.
I see this being thrown sometimes, but, honestly, it feels like a "HN is becoming reddit" situation. Would be interesting to see a study or a review of recent comments to confirm if that's really true.