Not sure it really matters?
300 WinMag, 30 PRC, 30 Nosler...
Some people can't drink the same grape cool aid for long before they want to try something new.
Something about "variety is the spice of life", and such.
I absolutely LOVE my 300 Win Mags... all 4 of them! But I'm not gonna fault, judge, pick apart, point out someone for trying something new on the menu... even if it's just the difference between Grilled Ribeye, medium rare, and Grilled Ribeye garlic and pepper, medium rare.
I figured out the reinvention of the wheel, the new shiny, all that stuff.
It simply APPEALS to some people!
Certainly is nice they can exercise their freedom of choice!
Just because they're different, doesn't make them bad...
If there wasn't a "different", I wouldn't be shooting my 300 Win Mags today!! We'd all stillI have a 300 H&H.
Now, I may still build me an H&H, I LIKE nostalgia! History! Etc. (Besides, my Dad has one and I really like the gun.) Well, that ain't for everybody, either!!
Anyway, not trying to start anything, just trying to explain.