KT3, 5.8.1.1 -> 5.8.5 : jb auto-reinstalled as intended.
Bummer:
Now you can't take a screenshot unless the device is registered.
And registration process requires you to agree to Amazon's EULA.
Well, we have been ignoring that for nearly a decade, I guess we can keep on ignoring it.
A nice point -
They did a good job of cleaning up the Settings menu.
Much less chance of someone hitting "Reset Device" when they wanted "Restart".
Note that the labels are more distinct now.

Any similarity with the KUAL menu is, I am sure, unintended.
Audio was last seen on the KT -
I don't know about the KT2 (mine is still disassembled).
But the KT3 on 5.8.5 does audio output via Bluetooth (something else to modify - make Bluetooth general not just speakers).