*Author: Gu Yu, ChainCatcher* After ETH price hit a new low since last May, Ethereum founder Vitalik Buterin released a lengthy article today reflecting on the long-standing Layer2 strategy at the core of Ethereum, planning to increase investment in Layer1, which is expected to create a sensational impact across the entire crypto industry. The original roadmap centered around Rollup defined Layer2 as sharded support for Ethereum, providing trustless block space. In this article, Vitalik seems to have abandoned his previous advocacy for a "Rollup-centric" scaling model. He pointed out that while Ethereum's base layer is scaling, the decentralization speed of Layer 2 is "far slower than expected," and many Layer2 solutions cannot or are unwilling to meet the requirements of true sharding.