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When KF8 was released by Amazon it was not supported in the iOS app, possibly due to Apple's restrictions on HTML rendering software. (KF8 is based on an outdated version of Webkit.)
The iOS app instead uses the web-based KCR (Kindle Cloud Reader) renderer. AZK format was developed as a means to sideload KCR content into the iOS app for testing.
AZK is pretty much useless at this point. Most books that are properly coded will end up supporting enhanced typesetting and will be delivered to the iOS app in the newer KFX format. For those books sideloading AZK does not reflect how the book will actually appear in that app when published.
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