I see it the other way around, looks like they disabled it on the client to see if they get a reaction. if yes, they can always re-enable it.
the problem is now, that only the most recent version of the Kindle app works in android 4.3 - all older versions crash.. so, if you want to keep syncing, use the 4.0.2.1 Kindle app and jelly bean 4.2 for now..
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