OAuth 2.0 exists to solve authorization securely, but its complexity creates friction that slows teams and breaks systems. Misconfigured scopes, refresh token mishandling, inconsistent provider implementations — each adds hours to debugging and weeks to delivery. API downtime, broken integrations, and hard-to-reproduce authentication bugs pile up.
The protocol’s flexibility is both its weapon and its trap. Each provider — Google, Microsoft, GitHub, custom identity servers — interprets OAuth 2.0 in its own way. The spec leaves room for optional parameters, vendor-specific extensions, and inconsistent error responses. Engineers end up writing special-case code for every provider. Test suites swell with variations that only fail under real-world load.
Token management is another recurring pain point. Expiration intervals vary wildly. Some services revoke refresh tokens silently. Others return error messages that tell you nothing useful. Failing to handle the “401 Unauthorized” gracefully can cascade into failed jobs, empty dashboards, and user frustration.