Why every XMvpPresenter has @PerActivity annotation ?

[LoveqLRC]

such as

@PerActivity
public interface SplashMvpPresenter<V extends SplashMvpView> extends MvpPresenter<V> {

}

@PerActivity
public interface MainMvpPresenter<V extends MainMvpView> extends MvpPresenter<V> {
}

I think it's unnecessary

[janishar]

This is symbolic to indicate that each reference exists binded to a single activity. It is good for the readability.