The pcm update does not remove the limp mode or masks anything.
It just updates the software control for oil pressure which is used for CD control (on/off) according to details.
I am staying behind my quote that if you get your rocker arm fallen you will notice it sooner or later. The least there would be different sounds from the engine.
Its not the end of the world. There are much worse recalls like takata airbags, cars getting on fire, etc.
Just drive on sport or manual mode for a test if you are so worried.
You are correct in your statement that it doesn't mask anything or nullify limp mode. But you are way off base with your assumption that sounds from the engine are different or even noticeable performance in every day driving. In my case and in JJM86M we noticed nothing wrong with our vehicles until limp mode was activated. My wife and I had put 9000 miles on our car before this happened, and we had no indication af anything wrong. Performance or engine noise never changed from day we bought it. And to say there are much worse recalls such as the air bags or cars catching on fire is quite comical to me. If your car goes into limp mode while passing a vehicle and you have oncoming traffic, you may cause an accident. Which would hopefully activate your airbags and quite possibly cause a fire. So I will leave it to you to judge again which is worse.
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