I don't know how many 357 revolvers I've owned over the years, but it's a bunch. Smith & Wesson (27, 28, 19, 66, 13, 65 ...in multiples for each), Ruger (Speed & Security Six's, plus Blackhawks), Colts (Trooper and Python), Taurus (65 and 66), and probably some more I don't remember.
I almost never shoot 357 ammo in them. Why? Because I don't want to. I don't see much sense in using harder kicking, louder, more expensive ammo (even when I reload it, it does cost a little more) to punch a hole in a piece of paper. Paper doesn't take a lot of killing. I'm not a cop. I don't count on a 357 for self defense, and I don't hunt anything with a handgun.
So why not just buy a 38? Well, I do, but they didn't make Model 27's, 28's, and 19's and such in 38 Special, or if they did they're a lot harder to find. And a Model 15 is NOT the same as a Model 19. I know, I've got both.
Another factor. I reload almost all of my ammo. 38 brass is a lot less expensive, and a lot more common to find than 357. I helped a friend run his security guard training class many years ago and I picked up a paper grocery bag almost full of 38 brass. So I've got thousands of rounds of 38 brass. Not so much 357. People don't leave that at the range very often. I suppose people who shoot 357's either reload or know someone who does. Or like me, shoot 38's.
So, if I ever wanted to, I could shoot 357's. I just don't want to.
BTW. Same thing applies to 44 Magnum/44 Special also.