I’m not aware of any protocol limitations there, it’s just that monitors don’t bother to support refresh rates that low.

Experience at low frame rates will be choppy anyways, if it’s a fixed low framerate you can use LFC without quality degradation (say for movies) and if it’s a variable low framerate… you should be lowering your graphics settings to get better fps. Why spend extra engineering and hardware on a capability that won’t ever result in a good experience anyway?

…has it really come to this? From laughing at console people for their “cinematic FPS” to nvidia fanboys saying “my monitor supports lower framerates than yours”?