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I often read arguments in the Flawed Assumption stems in LR and find myself regarding them as things I hear often. I don't even mean to be all that nice in this observation.
I wish option E was literally always, "The argument has no flaws."
I guarantee that even if the LSAC issued a blanket statement saying that hypothetical option E was NEVER the correct answer, people who commonly use these hypothetical flawed techniques in day-to-day arguments would still pick E.