It would be great to make a/b testing withing workflows.
For example: You create a workflow with all its steps (emails, sms...) that triggers when someone submits a form. But you want to test the same workflow with the same trigger with different steps or messages. And also the end having the possibility to check the stats to see wich workflow worked best, for example: if the conversion objective of the workflow was a lead to book an appointment the ability to check that would be great.
You could also check which workflow worked best in the pipeline by using some filters but the stats could also work great