No stdlib will ever include all the "batteries" you need. And large stdlibs have their own set of problems, like stagnation, tying the library version to the language version, backwards compatibility garantees preventing evolution, and either needing a wide range of domain experts to maintain it, or having developers maintain components they don't have a deep understanding of.

I think the sweet spot is having an ecosystem of "blessed" libraries that are reviewed for security and quality, but are versioned independently of the language, and maintained by subject matter experts.