maybe it's indeed time to let the system package management(apt,rpm,etc) just manage a solid BASE system, and let Flatpak etc to manage their own application sandboxes on top, kind of like dockers.

Appimage is macos flavor, it never needs your sudo to install the package, which is nice.

Flatpak is a redhat flavor(kind of), it needs sudo sometimes, but OK.

Snap is a ubuntu flavor(kind of), it is like systemd that can overtake the whole system, it can install package and even the whole system I was told, too much as a package manager for me.

I don't use Snap. Appimage is not as widely adopted as the rest two? I think Flatpak is a great middle ground.

It will be really cool if KDE and Gnome work together to build this.