The reason it;s only on the Hopper 3 is because, for the umpteenth time, Amazon insisted that any device that hosts the Amazon Prime app must have Dolby Digital Plus and that's it.
I'm sorry Hipkat. But if I want to hate on Amazon, I will! (Says the guy with about 10 or 15 Alexa devices.) They could easily relax their DD+ requirement and expand their platforms and viewership. Why not do that?