Decent read, regarding the MI, running a higher performance instance, will that as badly affected when looking at the below?
Considerations and best practices
LRS migration in progress being suspended because of a system update might result in longer migration times. To make your migration time more predictable use https://docs.microsoft.com/en-us/azure/azure-sql/database/maintenance-window to configure a specific day/time for the system update to occur. Plan your migration start and completion outside of the scheduled maintenance window.
Note that critical system updates, such are security patches, cannot be scheduled within the maintenance window. Although a rare event, deployment of critical system updates will result in prolonged migration times by design.