This isn't unusual. The inner "bulb" of the Z4s are also dummies as well, but there's a corona around it for DRL. An aspect of BMW's design has always been double bulbs on each side, but it seems like the inner bulb is not always necessary these days to provide additional illumination.
I've never found BMW's Xenons to be dim though. Perhaps the leveling on your headlights need to be adjusted?
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