If i replace my cheap ST tires every two years
you get what you pay for.
fitting cheap tires and expecting premium performance is the mistake here.
It just seems so strange that there's a rash of blowouts from the old ST tires from China, and after those tires are replaced with good tires, the same people have no more blowouts. Same roads, same conditions, same trailer, same tow vehicle, same driver, but no more blowouts. Hmm, everything is the same except the tires, that may give you a clue about where the problem lies.
These are just my "anecdotal observations" of course. Sometimes real life contradicts theory.
I have the same experience, my tire problems vanished when I switched to truck LT tires. I personally believe ST tires are somehow linked to politicians just like ethanol in gas, and we know how beneficial that is.