People who did not study the data, or recognize the significance of it, madly rushed once more for a hardware solution to a software problem. Nothing can replace learning how to shoot. This should not be construed as critical of the FBI methodology. It is not. In fact, the things we learned as a result have really turned the engineering of handgun ammunition on its ear.
Today there is very little difference among the major maker's high end defensive ammo.
Because they all use the same method to test new designs. Years ago it was common knowledge that hollowpoint often plugged up and did not expand when they passed through heavy clothing, plywood or wallboard. Since those barriers are part of the FBI test, engineers went to work and found ways to improve expansion and penetration. It truly revolutionized the way law enforcement and defensive ammunition is designed. And we have more reliable ammunition as a result.