I honestly don't know the answer to the OPs question, but I do know what he is talking about.
It's not something that every customer will see in their panel either. Certain customers (especially ones that have been around awhile). May have databases on more than one datebase server. For those there is a button offering to move older databases to the new server, thus consolidating your databases.
It seems like this process should proceed without creating breakage, but since they didn't automatically do it, and rely on the user to initiate the change, there must be a reason. If you followed modern standards in your config file tho, breakage should be minimal. I disqualify that however by saying I haven't done it.