What makes open mat so important is that it streamlines the martial art. Ineffective techniques are quickly abandoned and effective ones are validated and spread
Open Mat: Free Expression Meets Some Good Old Research and Development
Robert Jamias

This statement is true. However, I think people need a balance between free sparring and specific training. For example, if you drill a sweep in class, classic “2 each side guys”, what are the possibility of practicing the sweep in real time sparring? Anyways I am going to write my opinions and alternatives in a full article soon. Cheers great article!