I have set up a few test cases here regarding my earlier post about MDT deployment breaking. Since we implemented the new LAPS in group policy, the registry key for disabling legacy mode did not work for us, which lead me to the process of staging devices in an OU without any LAPS policies. This lead to a wormhole of things to try, with the most reliable one for us being this method: https://www.deploymentresearch.com/moving-computers-to-another-ou-during-deployment-webservice-style/
The short of it is that you set up a web service that the task sequence reaches out to in order to trigger the OU change and reconfigure the task sequence to reference the staging and final OUs at appropriate times.
Is Microsoft planning on implementing some sort of native system that performs the same task within MDT? MDT is a product that seems to have been neglected lately and could use some love.