Deblasio maybe not because he’s too far left for this “centrist” administration, but why not Cuomo? I’ve heard he’s good friends with Biden
Cuomo has poor favorability ratings and therefore brings more harm than good.
In people's mind Soros/Obama/AOC/Coumo/De Blasio/Biden/Harris/Media/Science is all one big bad leftist axis of evil meant to destroy their life and take their your freedoms, but in they're not really all the same.
De Blasio's problem isn't whether or not he's 'left' enough. It's that he's a failure. The left doesn't consider you a success just because your views check the 'left' box.