It was never different, it hasn’t really changed since it was introduced ages ago.
This is a good intro, notice how the NSDocument controls the windows representing it, not the other way around.
The name is a little misleading for sure.
https://developer.apple.com/library/archive/documentation/DataManagement/Conceptual/DocBasedAppProgrammingGuideForOSX/KeyObjects/KeyObjects.html

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