The mind reels at the thought of using an impact gun. Surely you meant a cordless drill? At least the BMW tool fits in the holder provided.

I suspect that the elimination of the tool has less to do with cost, and more to do with real-world data on how often it was actually required. It was likely more of an insurance policy. The problem is that providing the tool made it seem like the sunroof was going to fail all the time. Really, how many times has a sunroof failed on any vehicle you have owned?

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue