A handful of years ago I was teaching fourth grade when the whole idea of the flipped classroom entered my radar. The Educause definition of the topic states:
The flipped classroom is a pedagogical model in which the typical lecture and homework elements of a course are reversed. Short video lectures are viewed by students at home before the class session, while in-class time is devoted to exercises, projects, or discussions.
In short, get the direct instruction out of the way so class time can be dedicated to problem solving.
Front-loading direct instruction goes against everything that I believe in as an educator, and therefore, so does the way in which most classrooms are flipped.