Imagine the complaints about Geoffrey Unsworth lensed titles in 4K. Superman (1978) comes to mind.
"There's no detail here! It's so soft!"
Ummmmm..... that was the intent?
I'm aware, but they are more "enhanced mono" than stereo. Like I described, what a mono track would sound like in a theatre with the appropriate reverb, etc.
Why? It's a mono film, and any Atmos track would likely only simulate how a mono film sounds in a movie theatre. Sounds like asking for 4K UHD on a 16mm title.