Biden's Economic and Domestic Policy Team Looking So Different From Obama's

What accounts for Biden's economic and domestic policy team looking so different from Obama's or the emergence of Ezra Klein's supply side progressivism. Something very different from the center of democratic wonky a decade ago. What then are the hard limits that remain even amid these shifts. What what remains beyond the pale? I think it's significant that the 2016 election was preceded not by an outright recession but by a real noticeable slowdown in the economy caused by the Fed raising interest rates.