Flathub aims to be the place to get and distribute apps for Linux. It is powered by Flatpak which allows Flathub apps to run on almost any Linux distribution.
How does it stack up against traditional package management and others like AUR and Nix?
I think their uses extend beyond obsolete software. In particular, trying to get updates out to a wide variety of Linux distros has generally meant a tradeoff between “move fast, break things” and “move slow, never change”. Flatpak gives you a stable set of libraries to work with and the ability to run multiple versions of those libraries at once. Linux package managers have a place, but their sheer proliferation means that for most applications to reach all desktop Linux users, they have to go through something like Flatpak for distribution.
I think their uses extend beyond obsolete software. In particular, trying to get updates out to a wide variety of Linux distros has generally meant a tradeoff between “move fast, break things” and “move slow, never change”. Flatpak gives you a stable set of libraries to work with and the ability to run multiple versions of those libraries at once. Linux package managers have a place, but their sheer proliferation means that for most applications to reach all desktop Linux users, they have to go through something like Flatpak for distribution.