Everything has its place.
If you look elsewhere, that becomes more apparent.
Take 'intermediate' .30/.32 caliber cartridges, for example:
.30 WCF (on the "weak" end, but still respectable)
.30 Remington
.303 Savage
7.62x39mm
7.62x45mm
.300 Savage
.30-40 Krag / .303 British
7.5x54mm
.308 Win / .307 Win
7.5x55mm
7.62x54R / 7.62x53R (getting into "high powered" territory)
Every one of the above cartridges has its place in the food chain. In some cases, at certain points in history, circumstances dictated that one cartridge be chosen over another. So, some of them are obsolete or at least extremely unpopular today. But, that doesn't mean that an obsolete cartridge or less popular cartridge need to die, or should have died.
In some cases, such as 7.62x45mm and 7.62x39mm, the fate of a cartridge was determined by nothing more than politics, contrary to the actual performance of the cartridges.
When it came time for Com-Bloc nations to standardize their small arms..... There was more infrastructure already in place for 7.62x39mm, and the developers much more powerful, than the backing of 7.62x45mm. For the intent and purpose of the cartridge, the x45mm was arguably better. But, for the intent and purpose of political gain, guided by the the 800 lb Russian gorilla, the x39mm won the battle. The rest is history...
My brothers shoot .45 Colts.
I shoot .44 Mag.
My brothers shoot .45 Auto.
I shoot 9x19mm.
My brothers' 'big bores' are fairly modern bottleneck cartridges.
My big bores are .444 Marlins.
Different strokes for different folks....