- cooperation between proposers seems unlike in an unfair market, especially in a semi-permissionless half-centralized sequencer setup
- considering slashing risks, the incentives to become a sequencer (despite tx fees) are unclear
- having a Searcher-Builder-Validator/Sequencer supply chain could lead to trusted social contracts between all actors
- should MEV be addressed on the application layer? this generate security concerns on the underlying protocol
- a fair marketplace would let searchers to look for predictable MEV state changes with profitable actions, with the security of the protocol (with the sequencer itself)