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?
Better than snaps and AppImages. Do I want every package on my system to be replaced by a Flatpak? No. Am I glad that I can ex. install Zotero as a Flatpak instead of having to build it myself? Yes.
Better than snaps and AppImages. Do I want every package on my system to be replaced by a Flatpak? No. Am I glad that I can ex. install Zotero as a Flatpak instead of having to build it myself? Yes.