Emulators have come a long way since the early days of software testing, but they are not a magic bullet and should not be relied upon for all situations. Virtual environments can mimic real-device problems, such as insufficient hardware or firmware version changes, but may also lead to tests that miss configuration nuances found in production environments. Emulators offer speed and flexibility by allowing quick changes to configurations, making them useful for testing applications with GPS, touch screens, biometric readers, and other device-specific features. However, real-device testing is essential for applications requiring precise accuracy, such as facial recognition or location-based tracking of dogs, where the behavior of the application in a specific environment cannot be simulated safely. Additionally, real-device testing provides higher quality documentation and insights into real-life conditions, which can assist with testing and quality assurance. The key takeaway is that both virtual testing and real-device testing are necessary to meet the challenges of continuous delivery, and a balance between the two should be maintained.