Not completely... But it would change the crappy brass problem. The reason is, those 2 cartridge are still just a reinvention of already well-established wheels. But if those are your cartridges of choice, more power to you. But it's just frustrating when something new comes out, and just because it's new, everyone forgets what was already out there, and it immediately becomes the "newest, greatest, bestest" just because some gun editor or youtube dick said it was. It's gotten so sad, someone could basically take a .300 WinMag, and remove the belt, give it a cool new fancy name, and the no-belt supporters would proclaim from the highest mountain tops how amazing of a cartridge it is, and how it's so much better than the .300 WinMag, never once realizing that it's the same exact thing, just without a belt...
If the 7mmRM isn't enough for you, buy a .28 Nosler. It already has good Nosler brass, and has become quite commonplace for both factory ammo and brass at local stores.
I like the .28 Nosler, and I've been a hardcore 7mm STW shooter for over 16 years. Still have 2 of them, and won't ever NOT have at least one in the safe. But the factory offered mag lengths do offer a bit of limitation to the cartridge's abilities, and that's where I have come to like the .28 Nosler design. It's basically 7mm STW performance in a shorter, fatter package that fits in a factory mag box better.
Just my personal opinion.