Blobs are a temporary form of data storage that are only required to be held by Ethereum nodes for 18 days. Archival nodes are free to store it forever if they

Blobs are a temporary form of data storage that are only required to be held by Ethereum nodes for 18 days. Archival nodes are free to store it forever if they wish, with a 1/N trust mechanism to verify an archived blob. Blobs contrast with permanent data storage in calldata, which is very expensive (due to its permanence). Layer 2's are currently significantly more centralized than Ethereum L1, but this is not a fundamental technological limitation, and can be improved significantly with more resources and time. L2s right now have fragmentation concerns, where users have poor experiences interacting with a ecosystem of 10+ L2s, but this is largely a UX concern that can be solved in my view, and shared sequencers can help this on a technical level. I wouldn't say Layer 2's have many intrinsic fundamental technological trade-offs.