1 hour ago, MasterShake2 said:So, let's look at this from a different perspective and one that doesn't require lots of historical reference and digging for the average person. In 1991 it was largely thought that force-on-force action i.e 2 big armies fighting a large conventional war, was dead. This was for 2 reasons, 1) the collapse of the Soviet Union and 2) the comically lopsided victory by coalition forces in the first Gulf War. It's important to note that at the time of the first Gulf War, Iraq had the 5th largest military in the world and, even though the United States wasn't alone, it also wasn't using it's full strength and it wiped the Iraqi Army and Air Force, suffering relatively minimal casualties in the process (the conflict was more intense than most think, but still pretty tame compared to battles in previous wars). Then you have a period of relative peace for a pretty long time. The conflicts that arose were mostly a large power fighting a smaller power or an insurgency and rarely if ever really delved into traditional force-on-force fighting with large formations sweeping movements and heavy use of integrated combined arms.
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This actually somewhat mirrors the Star Wars universe in the in the post Clone Wars -> Galactic Civil war period. The major threat (separatists) had been defeated and there wasn't a large challenge for the Galactic Empire to fight. Mostly just small insurrections and pirates and no large organized threats.
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Now, lets look at the technology. In 1991 the main battle tank of the US Army was the M1 Abrams. Right now, the main battle tank of the US Army is the M1 Abrams. In 1991 US Army mechanized infantry rode to battle in M2 Bradleys and cavalry in M3 Bradleys. right now, those are still the vehicles used by those particular formations. The primary small arms was the M16, still the primary small arm today and the one in use since Vietnam. The primary Squad Automatic Weapon was the M249 and that's still the case today. The primary attack helicopter was the AH-64 Apache and the primary transport helicopter was the UH-60 Blackhawk, both still in use today. The CH47 Chinook, a helicopter used in Vietnam is still the preferred heavy lift helicopter of the US Army.
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It's not that none of these platforms have seen advances in the last 28 years, they have, but none of those advances have really changed the fundamental role of any of these platforms and if the US Army of today picked a fight with the Operation Desert Storm US Army, they wouldn't exactly run them over. They'd still have enough technology over them to win, but it wouldn't be a blowout.
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The point is pretty self-explanatory, military technology always plateaus when there's no major threat. And, both in the case of modern insurgents and the various rebel factions in Star Wars, the opponents these large militaries are facing don't have the money or resources to put out equipment that forms a major threat, so the impetus to put out new innovations in major combat platforms is limited to non-existent.
In addition, The Empire was moving to fully adopt the Tarkin Doctrine by pouring resources into The Death Stars (with Starkiller Base as an even larger design on the horizon) and essentially centralize control through the threat of overwhelming and unstoppable violence. So improving infantry was not their priority (outside of a few specialized programs)