I absolutely disagree. As three article mentioned, a big draw of these screenings is for a person who watched and loved a film to take a friend or family member who hasn't yet.
You, who have watched the movie before, want to watch it again and relive the thrills (even if you know the plot), not watch a 10 minute featurette about the movie. If you can still be bothered, you'll stay after the credits. If you cannot be bothered, the featurette wasn't that interesting anyway.
Think about it this way: would you have the excited conversation of "wasn't it cool when so-and-so chopped whathisname's head with the sword!?!?" before or after actually watching the scene as intended?
It really depends on if I have seen the movie, and how recently. If it is going to contextualize the scene for me, then before, so I can think about what they said.
Back when DVD was king, I liked directors commentary where they talked throughout the entire move.