“Well, there actually wasn’t. It’s just that the metzius was actually kosher to begin with but Rav Moshe worked with a superimposed one.”
Ah, ok. So, it’s just that you guys feel qualified to “correct” the posek hador. I guess I can go ahead and trust all eruvin unconditionally now that random CR posters have stated that Reb Moshe didn’t know what he was talking about.
n0m:
Sadly, this discussion transcends the YWN coffeeroom. There is this whole website dedicated to making exactly the types of arguments we’re seeing here that I came across. There is a major constituency of people who want to argue all eruvin are inherently kosher and twist Reb Moshe’s words to sound like even he would agree. Rest assured, you haven’t gone insane; all the things you are saying are the normative shittah.