Doing pacman -Q | grep ' 0\.' locally I get 547 hits, with alacritty, bubblewrap, dconf, fzf, hyprland, mtr, neovim and more among them, software that is in wide use already, some of them quite old (dconf apparently almost two decades old).

I think people read too much into what is just a number for some projects, while for others (like semver zealots), the numbers carry actual meaning.