After a decade as an ML engineer/scientist immersed in Python’s async ecosystem, returning to Ruby felt like stepping back in time. Where was the async revolution? Why was everyone still using threads for everything? SolidQueue, Sidekiq, GoodJob – all thread-based. Even newer solutions defaulted to the same concurrency model. Coming from Python, where the entire community had reorganized around asyncio, this seemed bizarre. FastAPI replaced Flask. Every library spawned an async twin. The transfo...