In the rapidly evolving landscape of artificial intelligence, the development process has shifted dramatically from traditional programming to the use of AI-driven tools, which allow for the creation of complex applications with minimal human input. This shift has made measurement and real user monitoring (RUM) crucial for understanding app performance and user experience, as developers need to ensure that the machine-generated logic results in a positive user experience. RUM provides insights into user behavior, helping developers identify and address issues like inefficiency, poor performance, and user frustration. As code becomes increasingly commoditized and applications are built more by systems than by humans, developers' roles are evolving to focus more on tuning systems and optimizing the user experience. This new era demands real-time observability to match the high velocity of software development, emphasizing the importance of accountability and user-centric design in maintaining a competitive edge in an AI-driven world.