On February 19, Ethereum founder Vitalik Buterin responded to the question of "whether rollups are good for Ethereum in general or blood sucking, and whether ETH really needs these L2", saying that currently Ethereum adopts a hybrid L1 + L2 expansion scheme, but it is still necessary to clearly define the respective transaction scope of the L1 and L2 layers. Vitalik said that moving all transactions to L2 could weaken ETH's position as a medium of exchange and store of value, and that cross-L2 operations still need to rely on L1. At the same time, it is not feasible to keep all transactions in L1, because it may lead to centralization and cannot meet the infinite growth of on-chain transactions. The right balance needs to be found between these two extremes to provide users with the optimal solution.