I happen to work for a commercial touch screen and android OEM. In my position, I needed to test a 50” 4K IDS display, and since i work from home it had to be shipped to me and we don’t exactly have a “return” option. It’s now in my bedroom with an Apple TV 4K on it.

You’re right. This is likely the only way to get a “dumb” display and tbh it’s not even the “best” display tech because it’s for commercial use, designed to run for longer hours with higher reliability at the cost of the newer fancier bells and whistles. But i didn’t pay for it and it’d pretty decent. I’m not complaining. And you’re also right that no one will actually sell you one of these. You have to buy it through a distributor at volume. Getting one outside of my weird circumstances as a one-off is basically not possible at all.