I’ve run into problems with both Snap and Flatpack because of the containerization. I prefer software installed or built locally the normal way, but Appimage and Flatpak are acceptable second choices. Snap is the one I only use as a last resort because it forces you to use Canonical’s closed source package server. Software authors cannot setup their own Snap servers and publish their packages directly. Everyone using Snap has to go through Canonical’s controlled server. Canonical is trying to create their own fully controlled app store like Google, Apple, and Microsoft. I’ve read that Snap is a bit better than Flatpak on the technology side, but it needs to either open up or die. It makes perfect sense that Canonical would remove their main competition by default. It’s a good thing they can’t remove support for AppImages. They’re fully self contained executables. I use Pop!_OS (the System76 Ubuntu flavour) on my desktops. It removes Snap by default in favour of Flatpak. They list apps on FlatHub alongside Apt packages in their GUI software centre. They’ll make sure Flatpak is still there.