I have an LG Smart TV, and I use the build-in apps because I'm not aware any devices provide 12-bit 4k output without some sort of signal processing that I don'

I have an LG Smart TV, and I use the build-in apps because I'm not aware any devices provide 12-bit 4k output without some sort of signal processing that I don't want. Admittedly, it's been a while (and a couple of Apple TV 4k software revisions) since I've checked, but as you get into newer display technologies it's harder to find devices that can provide you the same experience you'd get from the built-in app.