There's a very good reason for this "common attitude", and it is network effects with their benefits for productivity. If the standard library includes a useful

There's a very good reason for this "common attitude", and it is network effects with their benefits for productivity. If the standard library includes a useful abstraction, then your code and my code that use that abstraction have an easier time interoperating, and so does the entire rest of the world. That's really handy.