In which scenario would user involvement be least beneficial?

User involvement is least beneficial in a scenario where there is a fully automated system with no end-user interactions. In this context, since the system operates independently without any direct input or interaction from users, their feedback or involvement would not contribute to system improvements or functionality. The design and operation of such a system typically rely on pre-defined parameters and programming that do not require ongoing user engagement.

In contrast, user involvement is significantly beneficial during the initial planning and analysis stages, as well as when defining system requirements and features, because contributions from users can provide critical insights and ensure that the system aligns with their needs. Similarly, feedback on user interface design is vital, as users can identify usability issues and suggest enhancements that improve their experience. Thus, in situations where user interaction is nonexistent, the potential for user involvement to add value is minimal.