Here are my reasons for believing that Amazon isn’t going to invest resources in improving kindlegen and that conversion from EPUB is likely to remain the same.
Amazon considers the kindle formats produced by kindlegen to be frozen, legacy products. All development has gone into KFX format for years. Amazon does not convert personal documents to KFX so that purchased books will yield a superior reading experience.
Kindlegen has been unchanged for almost a decade. Getting developers up to speed on it would be expensive.
Publishers have had to put up with kindlegen’s issues and yet Amazon did not improve it even though they stood to profit from the books it produces. Fixing it to help customers avoid buying books from Amazon would be silly.
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