My reply was "Flat Mode by Choice" simply because that's the way I got used to forums being. My previous experiences with vBulletin, phpBB, Simple Machines Forum (SMF) (my favorite), and others have not had a "threaded" view (by default anyway). The threaded mode seems to stem from newsgroups and the like, in my opinion.
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“Hiking is just walking where it’s okay to pee. Sometimes old people hike by mistake.” — Demitri Martin