I consider the Beretta 92 series to be the pinnacle of "Old School" design when it comes to full size DA/SA service pistols.
When you take a moment to really examine a Beretta 92, you will see a lot of older engineering and old school manufacturing style.
Other than maybe the grips, there's no plastic. The frame is aluminum and very intricately machined. Many of the small parts are forged steel and finely machined. There are a lot of parts but there are no cheap parts. The machining that goes into the slide & barrel is skillfully executed. The steel used is high quality. Even things like grip screws and tiny springs are made with high precision.
Yeah, they're a bit large and they're probably a bit more complex than necessary; but they absolutely work.
The 92FS is the culmination of a LOT of evolution.
Shortly after WWII, Beretta introduced the model 1951. That was a single action, single stack mag, full sized pistol chambered in 9mm. It was fairly pedestrian by today's standards but it contained a lot of the DNA of the later 92 series. In the model 1951 we see the familiar Beretta open top slide (a carry over from earlier Berettas), the Walther style locking block and the basic layout of what later becomes the 92.
In the mid 1970's Beretta introduced the 92 and we see an aluminum frame capable of holding a double stack magazine. We also see a DA/SA system.
We then see a series of incremental developments. Magazine release moved to the American position, a passive firing pin block, changes to the safety, tweaks to the style of the grip, hard chrome lined barrel,...... but the basic DNA remains - open top slide, tilting locking block, hammer fired, DA/SA trigger.
I suspect the Beretta 92 series will be the last of the Old School style service pistols. At least on a large production scale.