Looks like there might be hope though...not sure if this applies to all the brands, but:
Since I first published this article, LG and Dolby have both provided me with official statements on the situation. Here’s LGs:
"The Dolby Vision feature is currently in testing and LG is working closely with its partners to support functionality (including 4K @120Hz) on its 2021 OLEDs soon. More details about models will be shared soon"
And here is the actually quite interesting one from Dolby:
“Dolby Vision is a frame rate agnostic technology. Some TVs do not support Dolby Vision at 120 Hz currently and we are working closely with TV manufactures to update firmware support for Dolby Vision capabilities at 120 Hz.”