Quote:
Originally Posted by jhowell
Better typography, including hyphenation, was the first new feature out of the gate. Since then there has been page flip (which works great on LCD devices), improved manga reading on e-ink devices, and Kindle in Motion (which allows new kinds of page layouts that are not possible with KF8 or ePub.) I have seen hints of future improvements relating to mixed LTR and RTL text that may be coming. Who knows what else?
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Better typography and hyphenation could have been done with KF8 and Mobi. Page flip could have been done with KF8 and Mobi. Improved Manga could have been done with KF8 and Mobi. Kindle in Motion could have been done with KF8. So so far, all these new features did not need a new format and most could have even been made to work with Mobi. So given all of this, it's obvious that Amazon created KFX to lock in customers.
Right now, the only way to get these new features is with KFX (which means buying from Amazon). Amazon could have done all of this with KF8 and some features could even have made it to Mobi for Kindles not able to run KF8. Amazon created KFX so you cannot buy ePub from another vendor, convert to KF8 and get these features.