We have multiple cartridges in 24, 25, 26, 27, 28, and 30 calibers that all do exactly the same thing. What we REALLY need to do is develop the 23 and 29 caliber cartridges. I'm certain that we'll find perfection there. If someone just plugs the data into a computer we can develop the perfect bullet, barrel and cartridge cases to make everything else obsolete. I don't understand why something so obvious hasn't been done yet.
Sarcasm aside, we already have way too many cartridges that overlap. I could choose any one of the common, or even less common cartridges in any of the above calibers and hunt anything in North America.
But it is simply a lot easier to make that happen with some than others. I have no idea why, but the 25, and to a lesser degree 27 calibers cannot take advantage of modern bullets. Doesn't mean they couldn't, but rather than spend the time, money and effort to make something in 25 caliber better I can pick up any of the 24 caliber cartridges and do anything I can do with a 25. Or go up to a 26 caliber and beat the 25's. You run into the same thing when comparing 26 and 28 caliber vs the 27s.
Personally if they never manufactured another rifle or box of ammo in anything 25 or 27 caliber I don't think it would be any great loss. On the other hand if they only manufactured rifles in 25 and 27 caliber they would be perfectly capable of doing anything any other cartridge in any other caliber can do as long as they were designed to use a broad range of bullets and bullet weights. Today that isn't the case.