Short (3 mins) and simple. Mostly Jensen tripping over his own boots and Jared laughing so hard he snorts.
You’ve read the list. You’ve seen the mountain of content. Streaming gives you the episodes. The DVDs give you the experience . From Eric Kripke’s apologetic Bugs commentary to the raw, uncut emotion of the Swan Song deleted scene, the Supernatural Seasons 1-11 DVD extras are a time capsule of a fandom that refused to die.
Season 11 is a renaissance (the Amara/God plot). The extras are polished, final-season feeling (even though the show went to Season 15).