Honestly, there is no dodging a bullet, if the valve and its related components were not the made from the right materials or treated to increase its strength then it's a ticking time bomb and will fail. For some it may be early on and for others it could be at a higher interval. I don't care if my engine last to 100k miles, once it fails the whole engine detonates and is no longer usable. That is not good. I went to FORD parts yesterday and was shown that ordering the valves right now are black listed (you cannot order them separately). I am seriously thinking of replacing the valves myself once I know that the new improved valves are available to buy.
In general, I agree with you, but the statistical chance of a compromised motor making it to 100k miles is near 0. Sure, it could happen, but chances of winning the lottery are about the same.
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