the sandbox is the point! but yes there’s still shortcomings with the sandbox/portal implementation, but if snaps can find a way to improve the end user experience despite containerising (most) apps, then so can flatpak.
It’s similar to how we’re at that awkward cusp of Wayland being the one and only display protocol for Linux, but we’re still living with the awkward pitfalls and caveats that come with managing such a wide-ranging FOSS project.
There are other costs, too. Someone has to spend a LOT of time maintaining their repos: testing and reviewing each package, responding to bugs caused by each packaging format’s choice of dependencies, and doing this for multiple branches of supported distro version! Thats a lot of man hours that could still be used for app distribution, but combined could help make even more robust and secure applications than before.
And, if we’re honest, except for a few outliers like Nix, Gentoo, and a few others, there’s little functional difference to each package format, which simply came to exist to fill the same need before Linux was big enough to establish a “standard”.
Aaaanyway
I do think we could have package formats leveraging torrenting more though. It could make updates a bit harder to distribute quickly in theory but nothing fundamentally out of the realm of possibilities. Many distros even use torrents as their primary form of ISO distribution.