Use cases
Governance for L2s and rollups
Rollups concentrate enormous power in upgrade keys. Governance has to constrain them credibly.
Upgrade keys need public rules
Who can upgrade, under what delay, and how users are notified should be documented and enforced by contracts.
Security councils
A council with a narrow emergency mandate and public membership is preferable to an anonymous key holder.
Home chain, remote effect
Most rollup governance votes on L1 and executes on L2. Confirmation on the destination chain is part of execution.