Disclaimer
Flatpak uses OSTree, like Fedora Atomic Desktops (Silverblue, Kinoite etc) and similar to BTRFS snapshots.
So many files are deduplicated and linked, not actually there
https://gitlab.com/TheEvilSkeleton/flatpak-dedup-checker
50GB without
31GB with deduplication
21,4GB with BTRFS compression
Why do you care about 20gigs? A 128gb SSD is 10 bucks.
so, are you paying for it?
i cannot fit a ssd in my phone, and i only have 16gigs of soldered emmc so yeah flatpak isn’t an option for me, i keep my aur packages…