> I may very well be assuming things about G-OS that it doesn't yet have (or may never have).

No offence but... next time maybe make it clear that you are just assuming and don't have any experience with the thing you are describing?

> My mental picture would have been it having partitioned storage (to reduce chance of accidental over writes) filled with "random seeming 'noise'" that held hidden account specific data only accessible with a user provided key.

That would be a normal account on an encrypted phone. Nothing special about that.

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