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

You should keep using your existing workflow engine when it fully meets your current non-agentic workload requirements. Catalyst delivers meaningful additional value for long-lived, probabilistic agent workloads, while established workflow engines excel at their core standard use cases like internal data pipelines or formal business process management workflows. A phased, gradual migration strategy can help ease a smooth transition if you later decide to adopt Catalyst over the long term.