Dear Youdont,
“Hence, how can one say that Rav Moshe did not add to his shitos later on, regarding Brooklyn?”
One may be inclined to say so based on Raqv Moshe writing “that it is all printed at length in every detail in the first volume of Iggres Moshe. ” Rav Moshe himself clearly writes it, but some say (At least regarding eruvin in Brooklyn) that Rav Moshe is not entitled to his own opinion.
All this exact numbers stuff is what you say. It is nothing to do with Rav Moshe’s shitta. And is a very messy way to read the teshuvos.
I’m really sorry for you that you miss the essence of this thread and the reasons why the YV was so incensed twenty years ago. But you absolutely twisted Rav Moshe’s teshuva because you miss all the nuance of this sugya.
Anybody who actually knows how to learn, could see that I was tipping you off to the nuance for months. You were oblivious. You still are. Or you are pretending. I don’t mind that people use the eruv. I mind very much that people who can’t learn at all, refuse to give their attention to learn from those who do.