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The issue is the possibility, with extensive use, of causing some failure at the breach end of the barrel due to what is essentially flame cutting at the forcing cone location. When this has happened, it has been the result of using thousands upon thousands of rounds of "hot" loads with the lighter bullets.
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This is not the case. The problem also included cracked forcing cones and it occurred in many LE service revolvers with absolutely
WERE NOT subject to the firing of "thousands upon thousands" of rounds.
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The "problem" seemed to be excessive gas cutting of the top strap.
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The problem did not refer to gas cutting of the top strap but rather erosion and cracking of the barrel's forcing cone. It is not unusual to find to this day K-Frame .357 magnums with cracked forcing cones and there are no new factory replacement barrels.
Bruce