You make a great point about fiscal policy. Around 2010 we saw the beginning of the end of the Fed and Congress being able to work together on monetary and fiscal policy, and that clearly made Yellen (a labor economist with some Keynesian leanings) a lot less confident about raising rates. Powell seemed to substitute this with an uncomfortably close relationship to the Trump white house, which wasn't actually a real replacement for good fiscal policy. I was actually hoping/guessing that Biden in 2020 would replace Powell with someone his party preferred (even if it was Lael Brainard, who is a little too left-leaning for my taste - Raphael Bostic would have been great), but I guess Joe Manchin got in the way of that.