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So what’s the reason? Is a BMW dry clutch twin anymore advanced of an engine than one of their automobiles? I don’t know. I do know that a shared system has plenty of crud in the oil at 600 miles (or less) as I have seen it with my own two eyes.
The initial 600 miles service on any motorcycle, shared sump or not, involves any number of inspection and adjustment points as needed. Checking for nuts and bolts being properly torqued, headstock, spokes if so equipped, chain adjustment if equipped, etcetera. Some brands such as BMW are way more advanced in their electronics than, for instance, my Royal Enfield 650 P twin. So is the BMW first service rather considerable, requiring being hooked up to the dealers computer? I don’t know.
My RE does require its first service at 300 miles including a valve inspection. 300 miles seemed early to me but I am glad I did it. Plenty of glitter in the oil and a couple of the exhaust valves were out of spec.
Motorcycles just seem to require more maintenance as compared to a car. It is not an inexpensive hobby. They go through tires quickly and most require periodic valve adjustments to name just a couple of things.