Originally Posted by HarryT
They effectively have gone for a form of ePub. The "KF8" format which most Kindle books now use is essentially ePub 3 in a Mobi "wrapper".
KF8 is essentially no better then ePub. Publishers are not going to want to create an eBook in ePub and then have to create one in KF8. They will create one in ePub and use that as the source for the KF8/Mobi versions.