.270 is my go-to whitetail deer rifle. It obviously hits harder at closer range (huge case capacity advantage over CM).
But that's a long action cartridge, so I don't bother to compare it to CM. The fact that CM is superior in most ways at longer distances, despite a huge case capacity handicap is impressive.
I guess if you can't think beyond a neck size you could similarly say that large .30 caliber rifles have been around for over a century, but it'd be pretty ignorant to say that .300PRC is just some reinvention of .30-06.
Again- more of the same creedmoor hype straw man reference used as an excuse to throw shade. On this 30 page thread there aren't many (any?) ridiculous claims about its capabilities that would be considering it "messianic" (except joking). For a short action cartridge that can take medium game out to medium range and also double as a target round out to 1k, it's hard to touch it. Rem had their chance with .260, but they screwed it up and unimaginatively just necked down a .308; built and marketed it to be a light for caliber varmint round with a slow twist rate. Sure- guys in the custom world figured out how to address those shortcomings, but the damage was done- the response was DeMille and Emary built a better mouse trap.