This level of dynamism is commonly forgotten/omitted because it is most often not at all needed. "There is no object identity across the values [retrieved by self.x]" is a very curious choice to many.
It's very Pythonic to expose e.g. state via the existence of attributes. This also makes it possible to dynamically expose foreign language interfaces. You can really craft the interface you like, because the interface exposal is also normal code that returns strings and objects.
You are right that it is not needed often, but there is often somewhere a part in the library stack that does exactly this, to expose a nice interface.
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