I don't really understand the pedantic rabbit hole this discussion has descended into. Quite frankly I don't give a sh%t what purpose the brake disc shields provide, and I honestly don't care what anyone's opinion regarding them is.
The facts are:
- A G29 Z4 owner has experienced an issue with rocks getting stuck between the rotor and the shield.
- This has occurred on multiple occasions.
- Other forum members have experienced the same issue.
- A case has been submitted to BMW for review.
- The OP has asked, that anyone experiencing this issue, to report it to their service center as well.
- This thread is intended to track the status of this issue [if it occurs to more owners] and any possible remedies provided by BMW.
That's it.