For operators already using Testing/Trixie/Debian 13 this will lead to dependency version conflicts and/or loss of existing service; for upgrades from Stable/Bookworm/Debian 12 likewise.
systemd-resolved package depends on the exact same version of other systemd packages. When they try to upgrade to newer versions the installed-but-orphaned systemd-resolved package will prevent it unless it is removed.
New installs can use resolvconf.
[0] https://tracker.debian.org/news/1632477/accepted-systemd-2574-4-source-into-unstable/
[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1098914
And bluca chose to fuck his users by breaking there shit on purpose.
Very nice, very systemd-ish :/