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I find that KFX lacks flexibility in line height and other settings. Since I also edit most ebooks before sending them to an ereader, this negates many of the claimed advantages to KFX.
For those reasons, I still prefer to use azw3/KF8 to send to a Kindle ereader. KF8/azw3 is very similar to ePub in structure. If I am starting with an azw3/KF8 ebook, I use the Kindle Unpack plugin to ePub. I get an output file which inherits the structure from the original whereas using calibre's conversion pipeline basically trashes most of the original structure. Editing the epub and then converting to azw3/KF8 is not much different from editing the ePub and then converting to KFX.
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