Yeah this is true. I wanted to detail it a bit more like "25 lines of code using FaceFilter API" but there are not enough characters available in a post 8-)
Yeah, you could do this in '1 line of code' if you just made another wrapper.
Yes, but the library is still quite generalistic (it would not make sense for example to include the drawing of the yellow rectangle in the lib or to not have access to the raw detection parameters).
Although the two libraries total to about 64Kb; not so bad