God of V: ​​Eth 2.0 client does not store state, basically performs the same verification as usual

God V said that the Eth 2.0 blockchain will be more portable. Except that it does not store the state, the client basically performs the same verification as usual, except that it obtains the state in real time and uses the (client's) Merkle proof to verify it. This (Eth 1.x) state can be copied and run in the PoS chain. The account balance and all applications remain intact, but the existing PoW chain will disappear. And there are not even two independent chains: Eth 1.x transactions and Eth 2.0 are in the same block.