Ethereum has low daily activity, high fees, slow speed, and struggles to support larger-scale applications. A sudden major hotspot can expose its flaws. Although it is decentralized, it is still influenced by Vitalik and the foundation; while it does not crash, the network experiences lag when slightly congested. Its security is slightly better than other public chains, but still inferior compared to PoW. PoS relies on human nature, while PoW is based on true mechanism consensus.