It would be useful from a reporting perspective to be able to reference the results of all the tasks in the workflow via the COMPLETED_WORKFLOW functionality.

Example:

{{ COMPLETED_WORKFLOW.ALL_TASKS }}

This would return a list of all the tasks and their results (not necessarily the data returned). Something indicating the status, ie. "succeeded" or "failed" and maybe error details/statuses returned on the action call (ie. 404, 200, etc. for the status and errors like 'Unauthorized'/'Not Found'.

This would allow people to create summary reports for workflow runs, saving people time from having to dig into workflow results.