A well-established DeFi protocol that was founded in 2017 and voluntarily chose all in roll up in 2021 is now "escaping" Layer 2 and returning to the mainnet's embrace. The amount of information behind this is indeed significant: 1) Synthetix's' big retreat 'directly poured cold water on the entire layer 2 narrative. Back then, everyone was building on various rollups with the goal of "low gas costs", but what was the result? Users are not buying at all, trading volume cannot increase, TVL cannot rise, and liquidity is diluted and divided. The generalization and stacking of various layer 2 have resulted in the failure of the layer 2 expansion strategy to achieve the expected effect, and instead become a burden on the main network? 2) Synthetix chose to return to the mainnet at this time, focusing on a neglected gap in the market: various derivative DEX products are flourishing on the rollup layer 2, but the Ethereum mainnet, as the platform with the strongest security consensus, lacks an old established PERPS platform that continuously adapts to the performance of the mainnet and follows its development. The logic is simple. Even the main network has focused on optimizing the performance of layer 1. How much can old DeFi expect from the explosive application of layer 2? 3) This is likely a landmark event in the transformation of the DeFi industry's development strategy. In the past, the pursuit of full coverage in multi chain environments brought about liquidity fragmentation, user experience fragmentation, and soaring operating costs. Now, we are actively shrinking our focus and focusing on the core market to create ultimate products. It is not difficult to understand that instead of performing mediocre on more than ten chains, it is better to strive for first place on the most important chain?