I would say that "improperly designed" is strictly a matter of opinion, when the Beretta 92FS is on safe, the firing pin plunger is turned down and points away from the firing pin, exactly how it was designed.
I'll elaborate since maybe I wasn't clear. It is not operable by the shooting hand without shifting the grip, and it removes the potential for keeping the pistol in a SA readiness mode unnecessarily.
I'll readily admit the Beretta is cosmetically better (ie toolmarks, etc) but the Taurus uses a better design IMHO which will trump aesthetics any day for me. I'll hasten to point out that my most recent version of the PT92 is a pre-lock and pre-rail model. I do not care for those newer "features".