It's amazing the number of people that thing shell scripts should be anything other than throwaway single-person hacks.
They should probably go through their whole system and verify that there aren't more shell scripts being used, e.g. in the init system. Ideally a default distro would have zero shell scripts.
Unfortunately your joke has wooshed over quite a few heads but what you say is true. The shell should be one of the most reliable parts of your operating system. Why on earth would you NOT trust the primary interface of your OS? Makes no sense.
You are being downvoted, but I agree with you.
I've always believed sh, csh, bash, etc, are very bad programming languages that require excessive efforts to learn how to write code in without unintentionally introducing bugs, including security holes.
I can't tell whether you're making a joke, seeing as the entire BSD init system is built on shell scripts.