That's a bit strong. Most languages come with a standard set of data structures, but that doesn't mean they make it impossible to implement other data structures if it suits you (e.g. few languages include binary trees as a standard data type, but that doesn't mean you can't use them).

C includes standard string algorithms, but that doesn't mean you can't write your own — you can even create your own string type if C strings are problematic for some reason.

Many things in many languages are there to offer a reasonable default that is generally useful. This seems along those lines to me.