In better designs, there will be just 4 places where Dagger’s components are being instantiated: sub-class of Application, base class of all app’s Activities, base class of all app’s Fragments, base class of all app’s Services.
IMHO, this new addition to Dagger, so called dagger-android, solves a non-existing problem.
Vasiliy Zukanov

How about if you have a Base class like BaseFragment but you want something that is not injected/provided in BaseFragment. You need to have a separate inject(MyFragment) method to get it. It is a bad decision to put all of the required dependecies in the Base class.