Similar to how running with a heel strike has been poo-pooed by modern medicine in favor of a midfoot or forefoot strike for joint health. (https://www.healthline.com/health/heel-strikes-and-your-run) I personally don't like the risk for my students. Couldn't live with myself if I was teaching something that potentially led to knee surgery and a shutdown of their career later on. But Monica seems to have had a long and healthy career, so what do I know.