I'm from the stone age so I might be able to shed some light on practical street level armed conflict.... No matter how you're trained -- in a real life shooting scenario most will shoot high... No, not because they were trained that way -it's becuase of how most react to adrenaline fueled extreme situations. As a result, I always advised my young guys (and gals) to deliberately aim a bit low on that once in a lifetime shooting situation. That advice was particularly valid if you had a shotgun in your hands at the time.
There may have been a shift in target orientation over time but I was never aware of it. Remember as well that things seen in movies may not accurately reflect how things are actually done (even if it's a Clint Eastwood movie). My last remark is particularly directed to all the stuff that had some former LAPD type as the technical adviser... since I was trained and worked on the other side of the country where we did lots of stuff differently (no matter what the local branch of LAPD International was doing....).