But if you want better arrays you want operator overload to be able to use these arrays as 1st class citizens without having to use array_get(arr, 3), array_len(arr), array_concatenate(arr1, arr2) etc... You want to be able to write "arr[3]", "arr.len()", "arr1 += arr2" etc... To implement operator overload you might need to add the concept of references.
If you want your arrays type-safe you'll need dark macro magic (actually possible in the latest standards I think) or proper templates/generics.
If you really want to make your arrays convenient to use you'll want destructors and RAII.
Then you'd like to be able to conveniently search, sort and filter those arrays. That's clunky without lambdas.
And once you get all that, why not move semantics and...
Conversely if you don't want any of this what's wrong with:
struct my_array {
my_type_t *buf;
size_t len;
}