[Undivide]

So finally, they removed the support of stuff they don't sell by intention ... yeah, too bad

I don't know why I am so surprised by this except for the fact that everything has worked plug & play since I bought the latest fire stick 2 years ago.  I am not familiar with IEC or how it is implemented into kodi.  All I know is the default recommended setting (audiotrack IEC/kodi IEC packer) for passthrough device does not let any sound make it to my soundbar.  
changing this to the audiotrack raw/android IEC packer allows my soundbar to pickup ac3/eac3 stream but everything else (DTS) gets down-sampled to dolby stereo.

not sure if anyone on the kodi team has firesticks to test on when they make code changes?

let me know if posting any logs from my stick would help.