When should I keep using my current workflow engine instead of Catalyst?

You should keep using your current workflow engine when its core design aligns with your primary operational use cases. Most general workflow tools are built for fixed directed acyclic graphs or scheduled batch data pipelines, not long-lived complex probabilistic agent runs needing consistent state across unpredictable branching partial failure scenarios. You should retain your existing engine if you do not need durable execution for agentic workloads with volatile branching paths.