I don’t think either of was discrediting the cartridge (assuming you were referring to the dialogue between Sean M. and I), but I do believe he hit the nail on the head on we need better shooters in general.
The podcast I was referring to is this:
https://m.youtube.com/watch?v=ZAy9QApbuJQ
There was a lot of dialogue by Ash Hess who had input in several Army training curriculum from what I understand and a theme of that video was essentially what Sean M. said (ETA: referring to good shooters and premium accuracy).
This video came out when the 7.62 was being pulled out of moth balls as an interim rifle to give us more capability against near peer enemies.
Ash indicated IIRC the issue was more so lack of proficiency on a large scale (paraphrasing) than a technical limitation.
This excerpt from that clip by Chuck of Presscheck Consulting also kind of indicated the same as far as 5.56 sufficiency.
https://m.youtube.com/watch?v=3Sh1gNW4yeI
Anyway, this thread is about replacing 7.62 platforms with 6.5 CM. But, to draw this rambling post to an end; it seems a better arrow is always good but a better Indian is probably better.
God Bless,
Brandon