I'm not sure I follow you but it wasn't a joke. Shell scripts are notoriously error-prone. I absolutely do not trust shell script authors to get everything right.
Also the shell isn't even "the primary interface of your OS". For Linux that's the Linux ABI, or arguably libc.
Unless you meant "human interface", in which case also no - KDE is the primary interface of my OS.
> I'm not sure I follow you but it wasn't a joke. Shell scripts are notoriously error-prone. I absolutely do not trust shell script authors to get everything right.
This is an extremely naive take as are the rest of your comments. Any language in the wrong hands is error prone.