Odaily News Vitalik said: “So far, our expansion method can be roughly understood as hybrid L1 + L2, but I think no one has clearly defined which transactions should be on L1 and which transactions should be on L2. The answer of 'everything should be on L2' is difficult to accept because:
*This makes it easy to lose ETH's position as a medium of exchange, store of value, etc. If you are worried that L2 will steal L1 users and not give L1 anything in return, this problem will be more serious in a situation where "L1 does almost nothing"
* Operations across L2 still require L1. If an L2 fails, users still need a way to move to another L2. So there are some use cases that are difficult to avoid L1.
The answer 'everything in L1' is also difficult to accept because:
*If L1 supports many transactions, it is easy to become centralized, even if ZK-EVM and other technologies are used
*The world’s demand for on-chain transactions is infinite. No matter how high the TPS of L1 is, you can always find an application that requires 10 times more TPS.”