ALL our titles have Enhanced Typesetting enabled. Most used the SAME epub2 file uploaded to Amazon KDP and Smashwords.
There are a few things not relevant to ordinary ebooks possible in epub3 and KFX, but almost all ebooks are fine being first in epub2.
KFX should generally be ignored by ebook fiction publishers. It's a thing primarily for Amazon to optimise delivery, "improve" DRM and only secondarily add "features" for specialist books not possible in epub2 or azw3/KF8.
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