Now that sir is a reasonable response. I’m not sure if that’s allowed on the internet.
My purist former match shooting self frowns on barrels shorter than 14.5 to 16 inches in cartridges that shine out to 500-600. If you’re shooting pistol distances, why not shoot pistol ammo and carry twice as much?
Unfortunately for me, you brought a valid argument to the table that I had not thought of. I still won’t get one because it doesn’t fill a niche that I need, but now I know why these are a thing.
Also consider subsonic cartridges that really SHINE in shorter barrels and with suppressors. I’ve fired some suppressed 10” 300Blackout pistols that are downright pleasant, while retaining impressive ballistics out to 300m.
Like you, however, I prefer to give my rifle cartridges at least 16” for the longer-range stuff.