The current definition of a great mobile user experience is too narrowly focused on performance metrics like load times and smooth scrolling, neglecting the broader user journey before and after app interaction. A truly seamless experience should allow users to transition effortlessly between different interaction modes, such as moving from a mobile browser to an app without the need for downloading or installing, while maintaining consistent functionality across platforms. Progressive Web Apps (PWAs) offer a solution by providing a native app experience with offline access and high performance without requiring installation, allowing developers to target multiple platforms with a single codebase. This approach challenges the traditional emphasis on performance, advocating for a more comprehensive view of user experience that encompasses all aspects of user interaction across devices.