The problem was with some people who were shooting a large quantity of very hot loads, the medium frame pistol is a little light for a constant diet of heavy loads, keep your loads moderate and it will be fine. The whole reason the Model 19 came out was to be a lighter weight pistol in 357 for officers who carried a pistol all day, the previous 357s had all been on large heavy frames, since most Police Officers carry a lot and shoot just a little, it was a good compromise.
Those 125 gr 357 loads became the hot item back when I was a Deputy, just about everybody switched over to them, but they are very hard on the K frame models, the 158 gr loads aren't quite so bad.