API Documentation vs Library Reference

[partypooper]

Personally currently in a stage of learning D I have found that 
[API Documentation](https://dlang.org/library/) is much more 
approachable and better structured than [Library 
Reference](https://dlang.org/phobos/index.html) maybe except for 
the modules by Mister Alexandresku, they are well structured even 
in the reference.

But the problem is that there is no any link to api documentation 
on the main page. And I actually found it by accident (maybe I'm 
just blind).
What do you think about structure of both of them and why there 
is one over the other?