A lot of things talked about are not practical for most hunters or recreation shooters since they will never notice the differences in a meaningful way. Sure, muzzle blast, recoil, bar stool brags but, the game they shoot, if any, or ranges they use them at, could be humanely taken with any number of legacy mainstream cartridges.
Is a 270 Win a good choice for Elk? Not one I would go to the store and buy one, however, if I was given one it would work pretty darn well at the ranges I would shoot.
A 7mm Remington Magnum will be a whole lot easier to source than a 7SAUM but, does that really matter to a hunter that only shoots ~40 rounds a year? The same goes if I can't shoot some new-fangled mono-metal super long hybrid and have to resort to using "classic" bullets.
Do I care if I use a 376 Steyr or 375H&H or 9.3x62 or 358 Norma Magnum on something in North America over one of these new cartridges on heavy game?