Hello,
The use case behind sending notification to the original user that executed the workflow is to handle workflows that can last for a long time and requires some manual check/approval before continue to the next step
Examples:
1. Removal of exports /CIFS and only after manual approval continue with volume removal
2. Migration of volumes - you can look at the "Migrate Volumes" sample workflow
In case you would like to send the notifications to other list users (can be all admins or any subset ) you can use place a DL (distribution list ) in the mail field of the operators.

We are also considering a future enhancement to send a daily mail to a list of users with the different workflow statutes .It may contain list of workflows pending for approvals