ALLHi Powers are made in Belgium and later models are assembled in Portugal under FN supervision and quality control. Further the newer guns are stronger and have better tolerances than the older guns. Forged frames were changed to cast as the weaker, forged frame broke when chambered for the .40
Tolerances aren't any better on the newer guns. The cast frame is stronger than the original forged frames. FN when cast because they could produce a stronger frame for less money using cast than they could using forging. Forging could produce a frame just as strong but it would cost more so they went cast.
I personally believe that the early T series guns are the best of the breed it terms of fit, finish and looks. For a long term hard duty use shooter, I am talking about 25,000 round count type guns, my preference is a MKIII.
Different tools for different roles.