Ubuntu OS sees 22.04 LTS Release

1. It's heavy. The sandbox performance is much, much slower than running software natively, and it's especially noticeable on older hardware. Newer hardware still has high latency when running things like games or even simple UIs through it. The only time I've seen screen tearing in a hardware-accelerated app is when I was using it in Flatpak.

2. It doesn't respect my desktop settings, environment variables or XDG options.

3. It's overly redundant. Packaging an entire system with your application is overkill, Nix and Guix are able to achieve better stability/consistency with less overhead and native binaries. Nobody should be forced to install a second system on top of their current one just to run an app.

4. Canonical:snap::GNOME:Flatpak. I greatly disagree with a lot of the decisions being made on Flatpak's development, but none of the maintainers will even hold discussions with you about the philosophy of the package manager. It's typical "my way or the highway" GNOME behavior.

5. It's non-portable. If we're sandboxing stuff anyways, why can't we just use portable binaries? I know it's because of their dynamic linking, but it's pretty unnecessary if they're going install software you already run natively a second time. Just go all-in or don't go at all. AppImage gets this right.

6. Their sandboxing model is genuinely awful. So many apps are misconfigured or broken out of the box, and it makes for a terrible user experience. Furthermore, many Flatpaks ship with carte-blanche filesystem access anyways, so it's hard to take their security argument seriously. Portals are dumb. Their permissions are neat, but also nothing new. Basically just a worse firejail.

There's a few more, but those are my biggest gripes. Native packaging with native sandboxing solves all of these complaints.