Comment 7 for bug 1892798

Arch used to use openresolv, openresolv compat was added to systemd-resolved, and yes hence they were able to switch to systemd-resolved providing openresolv symlink / compat / integration. Either by default, or as an option.

That is not possible for Debian/Ubuntu because of more than three dozen of packaging & hooks, calling resolvconf with .$suffix notation.

Please see previous bugs about this, trying to identify, enumerate and fix all of those usecases.