Leios brings native DA as a preliminary step. In-fact, better yet, it brings native DA proofs!
This is huge because DA proofs are a major point of centralization for L2s on Ethereum. This is because calldata (Ethereum native DA) is not available to smart contracts, so it is impossible to fully inherit the security of Ethereum for DA by verifying onchain that the root hashes in the state commitment actually correspond to the data published to DA.
With Leios, you can get a proof automatically onchain as the top level endorsement block’s certificate is part of a block. The endorsement block proves a majority of nodes have seen the first level EBs and therefore the blob data. The “endorsement” in this case can be attestation to the fact that the blob data corresponds to a given merkle root hash.