I'm running Ubuntu now and I'm in Snap hell.
It works well enough for some very basic apps, but for me personally, Snap has created far more problems than it has solved. With Firefox, for example, it makes it a lot harder to use some extensions, and FileBot is entirely useless without file system access (I mean, that's the entire point of the program).
I've heard Flatpak is better but my experience is somewhat limited. It could hardly be worse, though...
Each snap is mounted as its own filesystem, which is messy for several reasons (try making sense of the output of lsblk on your system). Flatpaks don't do that, though they sandbox in other ways. There really isn't a "Flatpak hell", the worst that can happen is packages that depend on different versions of the same library taking up a lot of storage space, which is a problem with snaps too.
I still prefer to rely on official repos but I do use a few Flatpaks here and there. But one of the main reasons why I don't run Ubuntu is because of Canonical's aggressive pushing of snaps.
I prefered AppImages, but now that I'm on Nix, I've gone back to native. Native packages work well in the NixOS ecosystem.
I like containerization for server applications, especially when running different services on one box. For desktop use, native libraries are stable and usually the applications being used are single instance. I don't see a point in running desktop apps in containers.
No doubt the benefits of technology on a server benefits the desktop user to some degree?
Containerization does add complexity in its assembly, but simplifies things for the system overall, which I think is appealing.
Still, that is just another abstraction away from the machine.
I still favor native packages, but I don't have a problem with Flatpaks. I'll use them when a program isn't available in the repo or there's a compelling reason to have a never version of an application. I'm on Debian Stable, so I'm obviously not obsessed with having the newest, shiniest version of everything.
Flatpak and Snap definitely make installation more simple. The packages come with their own dependencies so you have way less issues with conflicting dependencies. I like them when they are officially supported by the distribution or developer, but I prefer the official installations over supporting a random person making a package (not sure if this is a thing with Flatpak, but with Snaps that was definitely a thing).
Some software really benefits from not begin inside flatpak though, I had to switch back to the deb version of Visual Studio Code as the integrated console didn't have access to some software outside the package and was also logging weird errors.
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Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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