@adingbatponder «Does #nixos if pinned keep the old #systemd pre this nonsense?» I would think so (unless –of course– if you let some mechanism auto-update the pins), but would that be a good idea? It'd mean to also miss out on updates with security fixes.
So I guess it'd be better to let the corresponding nixpkgs package definition patch this feature out, or, if some in the community want it for whatever reason, introduce a compile-time option for it.