Lots of different foods came about due to technological limitations or specific needs for preservation, etc. that no longer apply. But they stuck around because people like eating them, and in that sense they aren't "outdated." Technically, you can get all your nutrition from those disgusting meal replacement powders and shit, so all prepared food is "outdated." But eating is about way more than getting nutrition. It's about social bonding, celebration, ritual, enjoyment, etc.