This is a big issue with Snap. It may be like Flatpak, allowing devs to set their own dependencies for ALL distros, but its poor uptake outside of Ubuntu’s ecosystem means that it’s no different to yet another distro repackaging system.
Flatpak, or even Nixpkgs, are the future because they allow devs to have control over the distribution of their software. Snap being such a closed ecosystem in comparison only means it will replicate many of the problems we’ve found with traditional (re)packaging systems.