It is amazing to see how flashlights have improved since then.
In quite a lot of ways, certainly. But for the most part, since you carried your Mag4D, many many flashlight models have appeared that are far worse, and, I would conservatively estimate, most. The choice selections are few and far between. Incan Mags really haven't gotten worse, though the newer incan Mags can't be hotwired because the socket will melt.
IMO, the most advanced flashlight ever designed is the Surefire A2 Aviator. They don't make those anymore. I suppose the Zebralight SC5x Mk II is pretty advanced for AA, and they're still somewhat available. IMO the very pinnacle of flashlight technology was the first and second generations of Surefire E2e. They're also no longer manufactured, and for some time. I think now what we have is hundreds if not thousands of flashlight makers that make crap, and about a dozen or two manufacturers that "get it," or nearly, and produce quality products. Maglite is still one of them, in their space and price range.