I'm not taking offense at all. But what you are saying isn't true.
If there were 100 pages of 6PRC, there would also be some issues, and some of those issues are customer issues, not rifle issues
In the hundreds of load devs I have done for myself or customers, you start to see a trend with cartridges. The 28 Nosler, 300 Rum, and the 6-7PRC come to mind as finicky.
I also agree with you, the 6PRC is a fantastic cartridge, especially with the new 6mm bullet offerings on the horizon. But the 6um30 is better cause you can load and go. But I might be a little biased on that one.