Interesting to note that the dollar has declined in tandem with economic policy uncertainty, as measured by the Baker, Bloom & Davis index (and predicted by historical correlations).
Not all else is held constant. Expected inflation has risen since the election — about 0.8 ppts on the 5 year breakeven — and the real ten year interest rate has fallen: about 15 bps.
That means the decline in the dollar’s value is over-explained. Real rates have fallen somewhat, despite rising expectations of a large fiscal package. Rising expected inflation is consistent with the dollar’s movement, although the increase has been almost 2 ppts since March of 2020.
From my perspective, dollar depreciation is a good thing, regardless of source. A depreciated dollar will encourage expenditure switching to the extent that exchange rate pass through is high (which is higher if from monetary shocks). I think a decrease in economic policy uncertainty is a win regardless — and that seems to have been delivered by the Biden election combined with unified control of the legislative branch.
By the way, the increase in expected five year inflation is a positive insofar as it helps achieve the real rate necessary to equilibrate aggregate demand to aggregate supply (i.e., set the real ex ante rate at the natural rate).