Many of the latest rounds are just reinventing old rounds with a new sales pitch. The 6.5cr is just a slightly shorter sweed, same as the 260rem, the 6.8PRC is pretty much a 6.5x68.
There's really not much that is actually new, many new powders up the performance of old rounds to match anything modern.

The old throw away line was the old time rounds were under powered to be safe in old rifles, so they made something new.
Yet there's more full raw loads for the 30/06 ect then there are lower power ones for the old rifles so that alone proves its BS.

New rounds sell new rifles, old rifles just keep working and that hurts sales.