Did something change regarding wing idea? Highly recommended Mustard video (their videos have great production quality) why one wing design didn't take off htt

Did something change regarding wing idea? Highly recommended Mustard video (their videos have great production quality) why one wing design didn't take off https://www.youtube.com/watch?v=dByvPIyIbZE https://www.youtube.com/watch?v=dByvPIyIbZE