A fintech team spends eight months migrating its entire backend to GraphQL because it "sounded modern," then watches performance degrade under load because every mobile client is now issuing deeply nested queries the resolver layer was never built to handle. Meanwhile, a logistics company bolts gRPC onto its public-facing customer API, only to discover that partner developers can't test an endpoint without generating client stubs first. Both teams solved a problem they didn't have and created on...