There's so much wrong in this conversation I will address one issue - 6.8 vs 6.5 as a comparative arguement were NEVER considered apples vs apples. The 6.8 users knew it was a DOD project to get 50% more power down the short barrel of the M4, and the longest range was close to 300m. 6.5 was based off the precision shooting case of the AK, meant for 20" + barrels, for long distance shooting, where it did well. Fans constantly barraged conversations with reams of charts and graphs not only showing it was far superior to 6.8, it even exceeded .308 ballistics. Nobody who shot 6.8 ever made a claim like that.
It was when the market demanded shorter 6.5s and wanted to use it in SBR's or AR pistols that tales were told "it's just the same as 6.8 but better!"
It seems there are still a few who try to make that claim. No, 6.8 was meant for more power at shorter ranges from shorter barrels, 6.5 was a long range precision round. Then .300 BO showed up based on renaming the .300 Whisper and the ".30 Cal is Gospel" shooters took it up. There is a notable divide in American tastes, some like metric, some abhor it and demand Inch Only. Goes to why we see so many new cartridges in Inch, to sell more widely across the market. It doesn't make any cartridge deliver foot pounds better or worse, it's just marketing to popularity..
Well, Biden sure was popular, 81 million votes.