How Does a Proposer-Builder Separation (PBS) Architecture Aim to Solve This Issue?

Proposer-Builder Separation (PBS) aims to mitigate issues like front-running and MEV centralization by splitting the roles of a validator. A "builder" specializes in constructing the most profitable block possible by ordering transactions.

A "proposer" (the validator chosen to create the next block) simply accepts the most profitable, pre-packaged block from a competitive market of builders without seeing the contents. This prevents the proposer from using their power to reorder transactions or steal MEV opportunities for themselves, while making access to MEV revenue more competitive.