few libraries

What do you want?

Admin Auth?
User Auth?
Membership Auth?
Social Media Auth?

As you can see there are just to many parameters to include an Auth System into the Framework...

I think all of these are needed and must be in the core library
I'm so shocked by some answers  
think about database
definitely it's more complex than for example authentication
how to connect
how to run queries
security
and many more specifications that must be considered
but CI handled it and has a complete library for it
my question is that whats the difference between "database" and "authentication" in this case???!!!