I haven’t distro hopped much in the past few years, so I am near clueless. I know that Linux Mint has a graphical updater and I vaguely remember openSUSE having it, though I’m not so sure on that one, because as I mentioned, it’s been a while. Especially curious if any Arch-based distros have it.
If I’m not mistake CachyOs comes with Shelly preinstalled now. While it can be a bit flaky with some esoteric aur packages it works fine for most things: pacman, flatpak, aur, even AppImage but I have not tried that.