Not sure if my original post went through-
The premise that no one argues about the LA Eruv is incorrect. There are Rabbonim who went to Rav Moshe about an Eruv in LA and Rav Moshe Paskened that LA can’t have an Eruv. A few Rabbanim after Rav Moshe was Niftar said that Rav Moshe was given the wrong Metzios. I personally heard directly from one of the Rabbanim who were part of the discussion with Rav Moshe say that he would not allow someone who uses the Eruv in LA to be an Aid at a Chasunah.
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