why use A.R.T?

So far…all I am seeing is that the plug in should have been for UE4…so does that mean that you do not need to use ART? ART has some good tools, I especially like the Picker for hands makes making a fist good, as well as the Auto use (hips, spine, etc)… I guess I need to work more with it ( I am having some issues with it)…which is why I asked…I have a character already built and want to use A RT. …But I cannot figure out how to use that character in ART… (any suggestions or links to a future are welcome)…