I haven't kept up with the thread well, but the ATV 4k also doesn't do 24Hz output. Have read some things suggesting the LG OLED displays can't do Dolby Vision at 60Hz, which is what the ATV outputs, even if you can live with the 3:2 pulldown and/or frame rate trickery.
This whole thing might be a swing and a miss for most people that actually own a DV display.
As a side note, I went thru my Apple movie content last night to delete stuff I want to re-download b/c a lot of it was 720p from early days settings. I found 7 movies that are gone from my library, as in they were downloaded but can't be downloaded again b/c they don't show in the "cloud". Most are available for purchase, but it's a newer version or something. Yay for our digital future. I know Vudu users have the same problem. I'm optimistic that Apple will help, but if I hadn't downloaded all my movies (which most don't) then I wouldn't even know.