That is a flawed argument as the is a big difference between using the shells at places where it makes sense and managing services using shell scripts. I mean

That is a flawed argument as the is a big difference between using the shells at places where it makes sense and managing services using shell scripts. I mean the shell is still used everywhere, like e.g. to configure and control systemd. Still I would say a lot of core shell tools are indeed outdated (for backwards compatibility).