More people commenting here need to pick up on this; this is how it's supposed to be.

The author also mentions:

> In effect, we are shifting complexity from end-developers to library developers.

This is not a valid complaint. This is obvious and self-evident; and also true for any lib developer in any language - you can't avoid it. Libraries exist to abstract away complex logic so those devs consuming the library don't have to worry about writing their own implementation - an app can delegate functionality to a library and this has the benefit of reducing the app's maintenance burden and speed up dev time by re-using another developer's work. And for lib devs, this inevitably requires they spend effort to make their library easier to use.