Reading the latest articles in Excellence about the IMS failures in almost all engines since water cooling

, i began to wonder how really prevalent it is? You have to think if there are companies that would build systems to alert you to upcoming failures due to metal in the oil, it's got to be a big issue.
If it's this bad and a fundamental design flaw, why wouldn't Porsche fix it, unless it's not that common and all hype. I know Porsche is famous for not fixing flaws (cough...Cayenne coolant tubes....cough), but surely if it spans multiple engines, they would recall for it? No?
How many f you have had it and on what car?
It seems like each newer Porsche I look at as the possibility of the "dreaded issue"
Bob