I hear you, outside ROON; the UI App should be a top priority in selecting your next streamer. And no one else does it better than Aurender and Innuos (2nd best) in terms of App performance and build quality. I found Aurender’s Conductor app to offer best SQ with least bit of coloration to original bit stream. They are not cheap but totally worth it when paired with equally exemplary DAC like Bricasti.
As @kennymacc pointed out, everything in digital chain matters just like analog. Digital is definitely less finicky compare to setting up a turntable but still needs bit of care if you want your digital to rival analog. First thing first, decide on a streamer and then tweak away.