What is the difference between Legacy Workflow Customization and Subflow Workflow Customization?
When should I use which type? Can I freely create new instances of either type as I please?
Official guidance much appreciated. Thanks!
For new customizations you only need to utilize subflows.
Legacy Customizations are no longer supported for creation. The system continues to honor legacy customizations that already exist. I do not know the exact date when this became enforced, but as of this post new legacy customizations can not be created in any release. Legacy customizations are expected to be sunset, but a timeframe for that is not set.
So unless you are maintaining legacy customizations you can safely focus on subflows as your solution for customizing Workflow.
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