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I am not sure I can answer all your questions, but this may clarify how things work somewhat.
The idea is that the first user created is the administrator. He can add new users. They are all automatically accounts of the same type. (Unlike with the old Family and Business accounts, you cannot mix accounts of different types. They are copying the less friendly G-Suite system that forces a total upgrade of everyone if anyone needs a feature only available at a higher subscription level.)
I am nearly sure the administrator (reminder: just the first user created) is the only account that can add and administer domains. The concept of "private" domains does not exist and, indeed, was removed from the older Family and Business account types some time ago.
I think, for the most part, if you know how the old Business accounts work, just replace "MasterUser" with "first created user" and you do understand how they work.
This is not an "official explanation".
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