At one point I owned both a G23 & a G32. I ran them head to head & found out I was more accurate & my times back on tgt were both better w/357sig. I promptly sold the G23. I also prefer the recoil characteristics of the 357sig over the .40.
OTOH, I completely agree that the cost & availability of 357sig ammo (I don't reload or buy online) makes it the reason why my G32 sits in the safe & some other calibers get carried & shot alot more. So what has 357sig done for me? It further proves that I don't need .40sw. But my 9mms & 45acps prove this, too.
Does it need to exist? Yes
Lone Star Glockers #85