Is there a question in there or are you sharing you experience with the community?

Mostly just sharing my experience, didn't see this documented anywhere and it caused me some headaches. 

If i had a question it would be if fs.mv could be updated to use the rename functionality under the hood with adls but that wasn't my intention with the post 

The tool is really meant for dbfs and is only accessible from within Databricks.  If I had to guess the idea is that most folks will not be using dbfs for production or sensitive data (for a host of good reasons) and as such there has not been a big investment in the Databricks Utility.  FYI, Unity Catalog volumes are the preferred method for storing all your data and artifacts.  Cheers, Lou.