It's not.

Not to that degree.

Unix frequently espouses "do one thing", but how much "one thing" is is always open to interpretation.

And it's never been quite as small as e.g. left-pad. It's more something like `printf` or `cat`, which do "print a formatted string" and "concatenate files" as their "one thing", respectively.

Let me reiterate: The problem isn't "single responsibility", the problem is "single responsibility for half a thing".

The pieces are just too tiny, which leads to an explosion of packages, which leads to packages being badly maintained.