I read a lot on my Kindle and on my phone, usually in the Kindle app. But sometimes I want to read on other devices as well. In those cases I'll convert the book I bought from Amazon in Calibre and then mail it to my devices so I won't have to worry about the device limits. It also let's me stay synced.
I have 4 Kindles, a phone, about 5 tablets with Kindle apps installed and registered. Most books are read on a Kindle or phone but sometimes I like to experiment and I'll use different devices and emailing the Kindle books helps with that.
As for the differences in KF8, KFX and mobi, who cares! It's the book that matters, not trivial matters such as hyphenation, etc. I know how to get those if I want them but I don't see any reason to.
Barry
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