What is a suitable use case for allowing users to decide when to launch a flow?

Allowing users to decide when to launch a flow is particularly suitable when the first element of the flow isn't a screen. In scenarios where the flow initiates without presenting a user interface, it often signifies that the process is designed to run in the background or does not require active user participation right from the start. This configuration can lead users to be more selective about when they want to invoke the flow, preserving resources and enhancing user experience by avoiding unnecessary execution of the flow when it’s not relevant.

In cases where the flow is only used occasionally, user-triggered execution allows for more efficient use of system resources, preventing clutter and ensuring that users only engage when they deem it necessary. While easy-to-understand elements might enhance user interaction, it does not inherently lead to the necessity of user-initiated flow launches. Mandatory execution, on the other hand, implies a requirement for the flow to run under certain conditions, subsequently overriding user choice on launching, which contradicts the notion of allowing user decision. Therefore, the context of the flow's structure and the necessity for user engagement justifies why the option relating to the first element not being a screen aligns best with user-triggered flow launches.