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Actually they fail shorted, or not able to turn off. What happens next is variable. The failure plasma can blow out enough material that there is not enough conduction to keep the short. Or there can be a big carbon crater with smoke. And after the failure when power gets turned back on there...

Likewise!

Nope, As far as matched parts, it's likely there are FETs and Diodes mounted to the same heatsink. They have different part numbers. As far as his statement that the FETs cascade fail is wrong too. Once a FET fails it takes the voltage rail down since it fails shorted. The other FETs don't see...

Respectfully, Yikes! I think you are saying something that has no basis in reality. Offshore manufacturing plants can be faulted with many things, but to categorize them as "using whatever random FETS that they can get their hands on ..." is just wrong. It would cost manufacturing more to have...