[noggin]

 it still plays them over PCM..
and its a great "hassle" free option   

Eh? It plays the DTS HD or Dolby True HD 5.1/7.1 stuff in PCM (just like a US$5 Raspberry Pi Zero) but without Atmos or DTS:x extensions?   

 I hope you are kidding at comparing Rasp Zero with A4K  

Only slightly.

My point was that when it come to True HD with Atmos or DTS:x - the ATV 4K and the Pi Zero have the same capabilities (PCM 5.1/7.1 only with no Atmos decode)  To be cheeky - the Pi supports 96 and 192kHz (though is limited to 4.0 at 192kHz).  The ATV 4K is currently 48k only I believe   

The ATV 4K is still a non-starter for lossless True HD with Atmos or DTS:x - the only Atmos compatibility is for lossy DD+/E-AC3 with Atmos (which is used for Netflix and Amazon Prime, but not usually for the primary audio tracks on Blu-rays)  For True HD + Atmos / DTS:x you need HD Audio bit streaming/passthrough, not decode to PCM.

(And yes I am aware the ATV 4K supports UHD, HEVC, HDR10 and DV etc...)