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Clean separation between controllers and routes is one of those things that looks simple but makes a big difference once a project grows. I learned this the hard way. Mixing logic and routing made refactoring painful when we later added API versioning and centralized error handling. Structuring it early saves a lot of time later.
I like how you connected this to real request flow. When I started building backend systems, I assumed async = automatic scalability too. Then I shipped a feature with heavy JSON parsing and watched the whole server freeze under load. Now I always offload CPU-heavy work to worker threads. The Event Loop is fast, but only if you keep it free.