I have high beam assist (non-matrix), and it works fine for me. It will mess up if I interfere, just got to trust that it WILL dip every time. It shows on the dash the blue high beam icon turns off/changes. In your case I assume main beam assist, adjusts and cuts out parts of the beam where the oncoming cars etc are detected. But why would this not be included on high beam? If its now two separate options for high/main beam assist , Audi have taken the options list too far! Stupid Audi.
