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Yes it's interesting if this is cited as one of the motivations.

That's a problem of a language being oriented around a single implementation. Is it even defined by this implementation?

Compare to eg. C or C++.

Diversity, and interoperability is important as it is a significant contributor to longevity.

I do like that you've used the term "API" as I think that sums it up. To think of "Python" not as a language agreed by multiple implementors, the behaviour here is that of a "library" with an "API".