For most books the only difference between azw3 and KFX is artificial in terms of typesetting/layout because they use the same upload to KDP. The difference isn't great. The reason for KFX seems to be to increase DRM and optimise Whispernet delivery, especially GSM/3G/4G which unlike your laptop, tablet or WiFi, Amazon and the Publisher is paying for.
Please select Download via PC (a tablet or phone works as does Mac and Linux) as other wise the Publisher is being charged and books the Publisher has selected as DRM free are having KFX DRM added.
There is nothing visually that Amazon couldn't add to azw/KF8 rendering on all the ereaders that support KFX. There is no change needed to the actual ebook azw files.
So please boycott KFX. You aren't missing much (just slightly fancier rendering on screen) compared to KF8. It's a nasty format.
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