Hard-won patterns from systems with real traffic — the failure modes and fixes you only learn in production.
A waiter who hands the ticket to the kitchen and works the floor can serve a full dining room. A waiter who stands at the kitchen window waiting for one dish starves everyone else. Your API makes the same choice every time you turn async code back into blocking code.
The Skipper's exception handling strategy was simple: when something goes wrong, throw it overboard and hope for the best. That's why Gilligan's Island had a three-year runtime. Your production API doesn't get three seasons to figure it out.