Haha. Gather round kiddies and let me tell you about the glory days when a fellah named Newton (not the physicist, although apparently fellahs named Newton are rather smart

) was designing some of the greatest cartridges in history. It was 1920, just 5 years after his most successful divine inspiration hit the world: the 250-3000. The original short action hotrod! He decides to neck it up to a 30 caliber and the 300 Savage is born.
Fast forward and condensing a longer story: the military is convinced that the modern case design of the 300 Savage with its too sharp 30degree shoulder and "minimal taper" is just going to be a reliability nightmare. It looks nothing like the comfortable and proven designs of the 1800s! They also decide that it's too compact and too slow to be effective. I mean human targets are so much tougher than elk and bear, so you need more power than such a puny little case can deliver. They want it to be longer, with more taper, and a shallower shoulder angle so that it looks more like what they're used to. They also want it to go about 150fps faster while burning 10grns more powder to do so to extend the "effective range" another 100 yards. What efficiency! That's clearly a great design change! And this is how the oversized turd named 308 Winchester was forced into existence.
To be clear: this is a colorful retelling of the "fact"s that somewhat glosses over many things that happened and influenced those decisions. I think it captures the military spirit accurately though when they go about choosing an equipment "upgrade"