Underbody Shield Problems of BMW M3

I currently own a 2003 BMW M3 coupe, manual transmission. The car has never been raced or taken to the track and has seen mostly city driving. All suspension components are stock or oem replacement parts. Upon inspection of the car, a trained technician found hairline fractures starting from the spot welds on the rear suspension subframe mounting points rendering the vehicle stationary until expensive reinforcing plates can be welded into the trunk. If a car company makes street-legal race cars and markets them to the public in that way it seems like a design flaw such as this would be repaired by the company. Again, this car was never raced or tracked and is experiencing the start of a catastrophic structural failure because it was driven on normal roads.

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I have a 2003 BMW M3. Just this week a cover (part#51717892955) on the under carriage broke. BMW made it out of plastic (why?). The service managers say a rock or bump could cause this part to break in two parts. This is what happened to my vehicle. When the part broke it went in to the middle of the road and another car ran over it. I'm unsure if any damage occured to the vehicle. I called the BMW service manager and he informed me that he sees 3 or 4 BMW M3s a week with this broken cover. This part being broken will not affect the cars drivability. Shouldn't BMW have a recall on this part if causes this much problem?.