ALL companies rely heavily on New Products, and this is true of ammo manufacturers. They are thus motivated to fill any teeny-tiny "gaps" in performance or convenience. I learned this lesson with the .22 Jet.
The what?
Yes, exactly. One of the major problems was the long tapered case would tend to back out of the chamber and jam against the revolver's recoil plate locking up your gun so you couldn't even open it to clear the jam without vigorous attention to the right side of the cylinder by your fist.
Then there was the .221 Remington Fireball.
The what?
Yes, exactly. That was the cartridge for this new product:
Which itself was another answer to a question nobody asked. Notice that you had to reach over the gun with your left hand to operate the action. Mucho awkwardo.
So I'm leery of any new cartridge which fulfills the foolish buyer's need for the latest and greatest ooo, ooo, gotta have it craving.
The .25 ACP I disagree with. It's cute and allows one to say "yo tengo una pistola" if necessary. I kept one ready-to-hand in my couch cushions for a while, even though I had another "real" gun nearby for seriousness. I farmed it out to one of my sons as part of a culling of my whole collection. But I think I still have reloading dies for .25 ACP which I never used.
The rest? Your opinion is as valid as mine or his.
As the saying goes, "That's what makes horse races."
Terry, 230RN