IMHO the servers with DA are amazing. There is one thing that is not supported and that is the ‘Delivery Tracking’ for inbound email. Otherwise DA has all the features that are needed.
I do not believe that MXroute is planning to do any migration from cPanel to DA accounts as they have a completely new email infrastructure in development utilizing WildDuck as the back end. That infrastructure should be available - soon. So rather than migrating accounts twice, the cPanel accounts will remain. I am certain that they would consider a request to be provisioned to DA but it would be entirely up to you to migrate accounts and emails to the new package on Lisa or Longhorn. Mention @Jarland or @Louis for further assistance or (most likely preferred) reach out to them on the MXroute Slack.