Relying on external APIs or databases within activities might lead to variability in workflow execution.

Also, on handling HTTP errors in activities by raising an "ApplicationError" based on the status code, might simplifies error handling but might need to see how it accounts for more complex scenarios where errors are transient or where a retry could be successful even for some client errors like rate limiting or temporary unavailability etc.

As the asyncio library itself does have a steep learning curve, integration of asyncio with workflow systems like Temporal that also uses Pythons native asynchronous features, developers should be careful about indirect or subtle bugs, especially in error handling and task management.