Devs are in control of updates with Flathub too. AppImages are a pretty bad format for anything I intend to use on a daily basis. It's better for one-off apps, kinda like portable EXE files on Windows. They don't integrate well with the desktop and don't work consistently on every distro. Then there's sandboxing. As a Flatpak, I can limit SilverBullet's filesystem access to wherever my Space is and SilverBullet, by default, only needs to have the permissions it actually needs.