Flutter's native integration testing simplifies cross-platform app testing by allowing developers to execute tests as Espresso or XCTest tests, eliminating the need for separate test frameworks and Appium-based test suites. This enables seamless integration with development workflows, reducing complexity and increasing efficiency. Additionally, Sauce Labs' Real Device Cloud provides a comprehensive testing experience, supporting both Android and iOS devices, including emulators and simulators, to help developers spot issues sooner and deliver reliable apps.