My understanding is that the slide-cracking issue was predominantly limited to limited numbers of relatively early production M9 pistols utilizing non-BUSA produced slides containing trace amounts of the element tellurium, which weakened them.
The issue was a highly contentious (and litiginous) one between Beretta and DoD, and concerned the inherent quality of the slides, potentially overpressure ammunition in the military lots, and deliberate use of overpressure ammunition by Navy SEALs. Frankly, from what I've read, I'm not sure that any one entity involved had totally blameless hands, and Beretta instituted the slide retention flange and slide groove on the 92 FS, which was a mechanical solution of sorts (and arguably somewhat unneeded once the slide/ammunition issues were sorted out).
I'm certainly not saying that you didn't have the problem as described with your slide, but I think that it was more of an anomoly than a systemmic issue, particularly with commercial 92s at the time. It's unfortunate that Beretta did not step up to the plate with your individual specimen. Out of curiosity, do you remember 1) if your problematic 92 was a commercial 92 (and was it made in Italy or by BUSA in the US), or 2) was it a M9 or BUSA-produced Police Special (whose slides were made on the same line and to the same standards as the M9 slides)?
Best, Jon