I was going to say it's NOT true. Any shop can align a BMW. The adjustments are very simple. That doesn't mean the alignment can be done without regard to EXTREME precision. My tech lets me sit in the car and I specify what settings I want.
Front only has ONE adjustment which is the same on ALL CARS via the tierod locknut.
The rear has CAMBER adjustment via eccentric bolt -- AGAIN same on ALL CARS.
Now the unique (YET EASY) rear toe setting is via the rear trailing arm. Three 18mm bolts. VERY easy. Loosen, move wheel to desired toe, then tighten bolts to 54 ft-lbs.