> Even Japan, which was our model for yield curve control has abandoned that theory.
Common please: Japan's rates have hovered around zero for about 30 years. Three decades. Japan has never been the model for yield curve and the theory they "abandoned" has been recently abandoned, after three decades.
Did you skip 2020? And this was before the pandemic https://www.brookings.edu/articles/the-new-tools-of-monetary...