You're basically saying all K frames will crack forcing cones with magnum ammo. Now that's a fairy tale. Your one gun experience isn't enough data to come to that conclusion.
I've fired a lot of full power .357 ammo through half a dozen K frame magnums over the decades and never had a problem.
Don't put words in that I didn't say........I said it can happen using any bullet. My 66 from the same era has never missed a lick. My 19 was bought new and had many rounds fired before this happened. So the myth hot loads with light bullets is just that........Sometimes it just happens.