Do You Really Need to Synchronize That State?
The ordering bug began before the actor. Fixing it eventually put registration and completion on the same stream, leaving the registry with one owner.
Concurrency
When the Architecture Survives the Rewrite
Reusing an architecture turned out to mean replacing most of its machinery and discovering which parts had actually been architecture all along.
Independent Components Without Deep DI
A scoped message channel can keep components independent without turning your app into a global event bus, as long as orchestration and state mutation stay centralized.