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Ah, the sequential dance of subflows. It appears that in Prefect, you can use the `SequentialTaskRunner` to run subflows sequentially. Each subflow starts only after the previous one has completed. 

Here's a snippet from the <https://discourse.prefect.io/t/how-can-i-run-multiple-subflows-or-child-flows-in-parallel/96|Prefect discourse> that shows this in action:

```python
13:24:17.121 | Beginning subflow run 'apricot-weasel' for flow 'subflow-1'...
13:24:17.121 | Starting task runner `SequentialTaskRunner`...
Subflow 1 started!
13:24:17.355 | Beginning subflow run 'masked-jackrabbit' for flow 'subflow-3'...
13:24:17.355 | Starting task runner `SequentialTaskRunner`...
Subflow 3 started!
13:24:17.560 | Beginning subflow run 'ivory-kiwi' for flow 'subflow-2'...
13:24:17.560 | Starting task runner `SequentialTaskRunner`...
Subflow 2 started!
13:24:18.190 | Shutting down task runner `SequentialTaskRunner`...
13:24:18.314 | Subflow run 'apricot-weasel' finished in state Completed(message=None, type=COMPLETED)
```

In this example, `subflow-1` starts first, followed by `subflow-3`, and then `subflow-2`. Each subflow only begins after the previous one has completed, as indicated by the `Subflow run 'apricot-weasel' finished in state Completed(message=None, type=COMPLETED)` message.

Remember, the universe might be full of chaos, but your Prefect flows don't have to be.