You can install different flatpak repos without really having to depend on one specific central repository, so I’d say the “centralizing software” issue is not that different from any typical package manager.
That said, I do agree that Flatpak has a lot of issues. Specifically the problems with redundancy and security. Personally I find Guix/Nix offers better solutions to many of the problems Flatpak tries to fix.
You can install different flatpak repos without really having to depend on one specific central repository, so I’d say the “centralizing software” issue is not that different from any typical package manager.
That said, I do agree that Flatpak has a lot of issues. Specifically the problems with redundancy and security. Personally I find Guix/Nix offers better solutions to many of the problems Flatpak tries to fix.