I am going to babble like a fool here. I've always wondered the same thing, yet at the same time loathe comparisons of a newly designed case to a 20th century favorite. Ballistics may be comparable, not the same.
I tend to not embrace New, doesn't mean I won't jump on the bandwagon later.
In the target world, the Dasher and then the 6BRA really kept things from going stagnant, my opinion only.
Hunting cases, wildcats, man, this new rd is 75fps faster and will kill all animals deader faster, deadest it will ever be, yet needs a newly designed action with the right length ejection port to make it a true thoroughbred takes it a hair too far. I'm a fudd, but I don't want you to call me one, hehe.
Also love guys designing their own wildcats just to have their name on a reamer design, hats off, reamer maker sold 2, both to you. Let's design a case with a 37.5 deg shoulder, because the 30, 35, and the 40 deg cannot possibly burn powder as efficient as my new 37.5 deg, this is a game changer.
Make no mistake, some new cases are the real deal, as was Win's WSM, maybe their WSSM, and Rem Saum, but both companies dropped support for them like a fat girlfriend.
Rant over, I have been like this my whole life, lack of enthusiasm for hype, the unproven, overly aggressive sales pitches.
Make no mistake, I have been wrong many times when new cartridges pop up, the latest the 6GT. I poured over case diagrams, case capacities, etc...and for the life of me, asked what was the purpose, well, I was off base, lol