As Flashbots states, below the present schematics Eth 1.x purchasers will nonetheless be in command of ordering transactions, equally to how miners order transactions utilizing Eth 1.x software program. The Beacon Chain will solely finalize these transactions by testifying and validating them by way of its staking community. Flashbots does state that validators, who act as block proposers, will ultimately be able to extracting MEV from merchants as the ultimate arbiter of a transaction.