I think one of the things for the flipped classroom was the cutesy saying "moving from sage on the stage to guide on the side." Just because it rhymes doesn't mean it's true, or the best way forward. It depends on the topic, but the absolute best teachers I had followed the so-called "sage on the stage" model, because they were really good teachers who knew their topic. One high school history teacher just lectured, and he held us enthralled the whole time, he was old and had a host of stories that illustrated various points, and was brutally truthful about politics (no playing with communism for him!). Telling him to flip the classroom and be a "guide on the side" would have meant far less learning for the students.