Ethereum co-founder Vitalik Buterin defended the switch from Proof-of-Work (PoW) to Proof-of-Stake (PoS) in a recent public presentation.Buterin claimed that the move was required and long-planned, addressing concerns about security, centralization, and environmental impact.He highlighted the benefits of PoS, such as better security, scalability, and less energy use.Buterin emphasized that the switch to PoS was carefully planned to preserve decentralization and uphold Ethereum's core ideals.