Amazon will never support epub because they are the predominant competitor with its own ebook formats and they want to have the complete control of their products.
And about kfx: it is a kind of never ending work in progress, it is totally undocumented and they almost never talk about kfx but they talk about Enhanced Typesetting.
No one else could afford this behavior but they are the biggest fish in the sea and they can do it.
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