Most teams ship with confidence because the numbers say they should. Test suite passed. QA signed off. Coverage is high. The logical conclusion is that the app is ready. But confidence built on testing metrics is not the same as confidence in real-world behavior. These are two different things, and most teams treat them as one. Testing validates a system under known conditions. It confirms that the flows you anticipated work the way you designed them. What it cannot do is account for what you did not anticipate - the device configurations you did not test on, the network conditions you did not simulate, the user behavior that does not follow the happy path. Coverage tells you how much of what you expected has been tested. It says nothing about what you missed. This distinction matters more in mobile than anywhere else. Mobile applications operate in environments that are structurally unpredictable.…