Are they so different that it’s justified to have so many different distributions? So far I guess that different package manager are the reason that divides the linux community. One may be on KDE and one on GNOME but they can use each other’s packages but usually you are bound to one manager
Yeah modern usage in general involves silo’d ABIs, be it Flatpak, Nix, Docker/Podman. Modern languages even try to move away from any ABI.
Of course there are upsides and downsides to the traditional approach.