Everything has a design flaw when you push it beyond the original expected limits. BB mopars love to crack between the main and cam bearing on #4 IIRC Stuff like that. Mopar should have done the OEM blocks like the X and R series to start with BUT, that would have meant more raw materials. DOH! Instead of making 50 blocks from a certain level of iron, they could only make 47-48 which cost $$$$$$ from the bottom line.That isn't consistent with cost accounting/making the most of what you have and providing a profit to company and shareholders.
Want to waste money on a SB girdle, go for it. No amount of dv talking will change the fact they are a waste of $. Pick your parts, pay your money.
It's not going to save an OEM production block from eating itself, same as fords at extreme HP/RPM levels.