“There are two opinions of reshus harrabim in the S”A. (OC 345:7) The first opinion states that markets and forums that are 16 amos wide (…sic…) the second opinion adds that if 600,000 don’t pass in it every day it is not a rsh”r.
There are numerous differences between these statements. Rav Moshe insisted that the only machlokes is about this minimum number. Three things come out from this. 1) There is no clear answer on what the first opinion holds is the minimum. 2) There is no differences that are dependent on this one. 3) What makes a rsh”r is the use of the area and not is shape and size.
So it follows that there are three psakim. 1) Without 600,000 we can always build an eiruv. And that has been the minhag as well. 2) The poskim that worked out instances of the Mishkanos Yaakov lekulah are not to be relied upon. That wasn’t the minhag. 3) The problem of d’oraysa is not about the circumstances of the town as much as the comprehensive area.”
What a bunch of gibberish. You are adding arguments to what Rav Moshe wrote.
Rav Moshe mentioned that we follow the vyesh omrim, lchatchilah. The rest of what you wrote is meaningless, and mostly incorrect. E.g. “The poskim that worked out instances of the Mishkanos Yaakov lekulah are not to be relied upon. That wasn’t the minhag.” Huh, the Mishkenos Yaakov was lechumrah. E.g. “The problem of d’oraysa is not about the circumstances of the town as much as the comprehensive area.” Huh, its about the number of people over an area of 12 mil by 12 mil, the area of the deigalei hamidbar.
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