The article addresses the use of ellipsoids directly. It acknowledges that the cut off remains effective. The same issue with the design exists though. The lights were designed for the much different shape of the halogen light source.
Safe? most likely. More effective lighting? I kind of doubt it.
Current ride... '13 GTI Wolfsburg
BMW's from my past...
'92 535i/5 '89 325ix/5
'98 750iL '86 325(e)/5
'95 740iL '84 318i/5