i actually modified my factory xenons on '02 4.6 to be bi-xenon... there is an excellent write up about it - i got the Audi projectors and swapped the BMW ones... both made by Hella, same hardware, mounting points... in my modified case, my "opened-wide" xenons were complimented by regular highbeams.

i am not so sure, but i believe in the programming of the car, where you delete the mutual exclusivity of the fogs and the high, you can also have halogen highbeams supplement the bi-xenons... why? well, maybe some people need it to reassure that the function works...

from the video it seems that the fogs are aimed too high, they cut into the xenon light footprint...