Selenium WebDriver is a popular tool for web automation, but it is not suitable for all testing scenarios, particularly those outside its core functionality of browser compatibility testing. The text outlines 24 specific scenarios where Selenium is not recommended, including testing Windows and Mac applications, native mobile apps, smart TV and WatchOS apps, and device/hardware testing. It also highlights the challenges of automating Captcha verification, barcode/QR code scanning, and visual testing, among others. The document emphasizes that while Selenium can be integrated with other tools for some tasks, such as image verification and API testing, manual testing or using specialized tools is often more effective for scenarios like security, performance, and usability testing. The article encourages testers to prioritize automation efforts where they can save time and resources, rather than attempting to automate every possible test case, thus acknowledging Selenium's limitations and advocating for a strategic approach to test automation.