I think most people are missing the biggest point. Essentially there is no difference between the 6.5-284 and the 6.5 PRC except for ammunition manufacturers support. Since the majority of people on this site handload, you can choose any number of 6.5 cartridges and be totally happy. The person that doesn't handload will have a hard time finding a box of ammo for a 6.5 GAP, SAUM, 6.5-06, 6.5-284, etc. A few rifle manufacturers produce a 6.5-284 but not many. Then you are into a custom rifle that is double or triple the price. Once again, to "us" that isn't a big deal. To the general public that is a turn off. So, just like the 6.5 Creedmoor, it's all about the marketing and support. I have a 6.5-284, 6.5x47, 6.5CM and now a 6.5 PRC. All of them are a joy to shoot but in a pinch I can buy ammo off the shelf for the CM and PRC.
A good podcast comparing the 6.5 PRC to the 6.5-284.
https://www.gunwerks.com/blogs/podcast/is-the-new-6-5-prc-here-to-stay
A good podcast comparing the 6.5 PRC to the 6.5-284.
https://www.gunwerks.com/blogs/podcast/is-the-new-6-5-prc-here-to-stay