In the history of cryptocurrency, no blockchain has undergone such a major change.
It is very rare to change the operation mechanism of the blockchain, let alone Ethereum, no other blockchain has made such a major change after it has established a huge on-chain economy.
The market cap of ETH assets today is $203 billion (previously it was $550 billion), and the value on its network is in the hundreds of millions. Ethereum has by far the strongest and most active economic ecosystem in cryptocurrencies, and the security of all these economic activities will move from PoW-based to PoS-based.