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Also the arguments against Flatpak imply RPMs & DEBs are magically sandboxed and people always stick to distro packages.
In reality, traditional software packaging does not sandbox *at all* and people often add third party repos (PPAs, Copr, OBS, Google Chrome, RPMfusion, AUR, etc.) and sometimes even install random kernel modules (VirtualBox, NVidia proprietary blob).
Flatpak is *already* several steps forward, even if there are more to go.