One part is about trust and software. Have you seen Fiio R7? That's pretty hideous.I know RME is a favorite of this forum, but I'm not sure why everyone is so quick to dismiss the K19. If it truly delivers on the advertised specs, then it bests the ADI-2 in just about every way.
Also, 31 bands is totally over the top. I don't see Fiio really concentrating on useful features or polishing them. And of course no safety features. It's just bits and pieces for way over $1000.
It has plenty of power and I have no doubts about amp and dac section. There's no reason they'd be off spec. Machining looks nice too. But for this price I need more.