There's always going to be some edge case that escaped test coverage or some use case that totally escaped the imaginations of developers in any product. The ch

There's always going to be some edge case that escaped test coverage or some use case that totally escaped the imaginations of developers in any product. The chances of such an error being discovered is probably a function of the total number of active application instances and some rough measure of complexity in the application's implementation. So yeah, I'd say generally speaking you're right on.