they are needed, linux need universals package manager, building for every single distro is a waste of time
Linux needed a universal package manager and it got three. Snap is not needed.
A bit of history. The first universal packaging format was snap by Canonical and used to be called Click apps and it was made for the Ubuntu mobile OS and later to the Ubuntu desktop. Red Hat in response to that created the FlatPak format. The AppImages are community effort.
AppImages long predate Snaps, but yes, Snaps do predate Flatpaks by a few months. There’s also Nix packages, which predate all three. Of course, this all matters very little compared to the merits of all four technologies. The heavy dependence on proprietary technology for repositories makes Snap clearly unsuitable to become the universal Linux package format.
