[lorendsr]

The major differences between an event bus and a workflow engine is the workflow engine:

- Creates and updates events/messages for you

- Maintains consistency between the events and timers and the state of the processing flow. More info on why this is important for correctness/resilience: https://youtu.be/t524U9CixZ0

The difference between workflow code and using an event bus is that with the former, the above is done automatically for you, and in the latter, it's done manually, which can be a lot of code to write and get right, and is harder to track/visualize what happened in production and debug. It would also take a lot of events to get an equivalent degree of reliability—the message processor would need to do a single step and then write the next event to the bus. So a 10-line workflow-as-code function would translate to 10 different events in the bus route.

Also, the event bus route doesn't have the new possibilities I listed in the parent comment.