while i more or less agree with what you wrote, saying that not using an eruv is “no real place for” “no poskim hold that it is real halachah” is absolutly false and ludicrous (i apologize for being so strong). if anything it is clear based on basic halacha in shulchan aruch that our city eruvim are 100% not kosher. the mishna berura and other achronim go to great length being “miyashev haminhag” why people rely on city eruvim. see O”CH 364:2 M:B 8 and BI”H there.
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