I was thinking of adding on a strut tower brace from Dinan.

But somebody mentioned on one of the threads (recently) that it may be unsafe in a crash, beacause it adds too much body rigidity, or maybe compromises crumple zones, or something to that effect? Has anyone heard anything like that? Also, if that is true, then why does a strut bar come "standard" in my friend's 2004 M3?