There’s NOTHING new! People keep rehashing the same ideas.
Maybe 90% accurate. Changes come in small increments. But over time several small changes add up to a significant difference. If we'd stopped innovating and trying to improve things, we'd all still be using sharp sticks to hunt with.
I have no issue with the 6.5 PRC. I also have no desire to own one. I have no issue with those who want to shoot big game at extended ranges as long as they have the skills to do it and use capable tools. I don't have those skills, nor does the vast majority of hunters.
I'm a little surprised that the 6.5 PRC is as popular as it is. There have been several fast 6.5's in the past that didn't succeed. And the additional speed the PRC offers over the Creedmoor version is of no use to the vast majority of shooters.
60-70 years ago, the flatter trajectory of cartridges like 270 and 25-06 were a small advantage which allowed easier hits on game out to around 300 yards with the bullets, and optics of the day. But today's bullets and optics have made virtually all modern cartridges legitimate 300-yard big game cartridges.
Beyond 300 yards all cartridges have enough bullet drop to require accurate range data and optics that will let you compensate for it. The fact that a 6.5 PRC shoots a little flatter than 6.5 CM just isn't much of an advantage. If you can dial in for 10" of bullet, drop with the 6.5 PRC, you can just as easily dial in for 15" of drop with the 6.5 Creedmoor. Or a 308, a 7-08, or a 30-06 etc.
To my mind the biggest advantage of the faster MV, (and higher BC bullets), is that impact velocity sufficient to cause bullet expansion is moved out to longer range. And a little less wind deflection. Trajectory is easy enough to compensate for.
Cartridges like 260, 6.5CM, 7-08, and 308 will still impact fast enough to get bullet expansion to at least 400, maybe 500 yards. That is farther than the vast majority of shooters can shoot. Being able to get bullet expansion at 600-700 yards is wasted on me. And most other shooters.
But as I said earlier if you have the skills or want to develop the skills for shooting at those ranges then I think it is a great choice. I've owned multiple 7mm and 300 magnums over the years. I've settled on 308 and 6.5CM and don't feel at all handicapped. And I still think the vast majority of shooters would be better off with cartridges in that class.