Reporting a high number of extractor failures in one batch of pistols is not vilifying S&W. I am not sure about the authenticity of the teletype, and have not seen anything like it posted at my agency, but then, we use .40 ammo. If a batch of 9mm extractors was not properly heat-treated, it may not affect other parts, such as extractors in the .40 M&Ps.
A bad extractor should reveal itself in the break-in process, if the pistol is fired rapidly enough to get it warm.
As one of the replies indicated, yes, there have been similar bulletins sent around to PDs regarding other weapons, too. Anyone who does not take such warnings seriously, does so at his own peril.
Break-in your pistols! Fire rapidly enough so that they get warm, so that any parts not properly heat-treated, or not properly alloyed, will make themselves known by warping or breaking under controlled conditions, and not during a gunfight.
I have experienced a Kimber extractor bending like a banana in the wrong direction the first time it got warm from shooting. I have experienced a now out-of-production pocket pistol's slide warping the first time it got warm, from being shot. Not all breakage occurs when new; I got home from work one morning to discover that the mainspring in my S&W duty revolver had snapped into two pieces. And, to think folks wonder why I carry a back-up.