I think there’s just not enough people who run them. I think the closest you’ll find is the nixos crowd.
I’ve wanted to give silverblue a go, but I know how to manage my fedora install pretty well and don’t feel like taking on a new project like that when at the end of the day I just want to load up steam and decompress. I have a feeling that the majority people who want to try it are in same place I am.
Though it’s getting more and more tempting to switch since the vast majority of my data and packages are installed in my home.