Tell us about your request I would like to see Docker Desktop for Linux available as a flatpak app that is distributed on flathub.org. Apps that offer flatpaks include: podman, VS Code, pycharm, su...
I would suspect that making a stable desktop inside docker ensures it would work everywhere else, no matter what the hw/sw of the host is.
I've only known docker as a building environment that ensures rebuildability and I can't say I ever liked it. I think its popularity comes from some myth of safety and security.