I think you are treating DAOs as a single monolithic idea, when it is more like an infant design space.
I would say the core idea of a DAO is this: how can we organize a disparate group of people around a common goal, more easily than in the past?
Whether you think they are a joke or not, ConstitutionDAO, SpiceDAO (which I think is the worst example in this space given their lack of diligence or thought on IP issues), OrangeDAO, FlamingoDAO, etc., are all unique in that they have organized a disparate group of people more quickly than in the past, and enabled them to more efficiently work together towards a shared goal.
There are many ideas being explored:
1. Can we have better laws (like Wyoming is exploring) or regulations?
2. If the DAO is decentralized enough, are the tokens still (or should they be) a security? Are there better ways to regulate something like this globally?
3. How do you coordinate a disparate group of people? How should you let in new entrants, or weight votes? How should a DAO manage its treasury?
4. What happens if all voting proposals are public and verifiable on the blockchain? Is that good or bad?
At it's core, yes, I think you can say that a DAO is basically the idea of a corporation, except with most of the discussion on Discord and with on-chain voting, and plus some securities laws issues that are at best gray areas and at worst, in some cases, clear violations. But I think that is ignoring that something worthwhile might come out of that design space.