@Marvin why might someone need a subflow?

Subflows are often used in scenarios where you have a complex workflow that can be logically divided into smaller, more manageable pieces. Having subflows can be beneficial for several reasons: 1. Modularity: Organizations might want to break down complex workflows into subflows for modularity, making the code easier to understand, maintain, and reuse. 2. Organization: Subflows allow teams to organize related tasks into separate groups, which can be easier to manage and test. 3. Reusability: If certain tasks or sequences of tasks are used in multiple flows, placing them in a subflow makes it possible to reuse that logic across different workflows without duplication. 4. Parallelism: Subflows can be executed in parallel, enabling more efficient use of resources and potentially reducing the overall execution time of the flow. 5. Scoped Parameterization: They allow for scoped parameterization, meaning you can pass specific parameters to a subflow which can then influence its behavior without affecting the main flow's parameters. 6. Error Handling: Subflows can have their own error handling strategies that are separate from the main flow, providing more granular control over what happens if something goes wrong in a specific part of the workflow. 7. Maintainability: When working in large teams, subflows can make it easier to divide work among developers since each subflow can be developed and tested independently before integrating it into the main workflow. In systems like Prefect, subflows provide a means to encapsulate distinct parts of a workflow that may be independently useful or logically separate from the main flow, which can simplify the design and execution of complex data pipelines.