I have "merged" in quotes because I am not sure if changing your D+ email changes it for your MDE account as well, or vice-versa.
If the merger of Disney Movie Rewards and Disney accounts, or the merger of Marvel and Disney accounts are any indication to go by, it's likely forever to always be a mess. Disney's goal for "one account system" has just been one wild ride after another. Given how many of their websites still in 2019 redirect to or through *.go.com for reasons unknown, I have to imagine their web tech stack is a fascinating archeology dive under the hood.
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If the merger of Disney Movie Rewards and Disney accounts, or the merger of Marvel and Disney accounts are any indication to go by, it's likely forever to always be a mess. Disney's goal for "one account system" has just been one wild ride after another. Given how many of their websites still in 2019 redirect to or through *.go.com for reasons unknown, I have to imagine their web tech stack is a fascinating archeology dive under the hood.