I enjoyed your insight here. The question about court packing has to be deflected. In the Fog of War, Robert MacNamara identified one of his rules as "always answer the question you wish they had asked."

If the Biden/Harris says that court packing is off the table then they will infuriate the progressives who might then not vote for them or stop giving and volunteering. If they commit to packing the court then they will turn off the moderate voters in swing states.

I have taught US history for over twenty years. FDR's attempt to pack the court ended up a disaster for him politically and for his party. Their consultants know this. I think the best move is to preserve the non-answer until after the election. I might say, "We are appalled at the way the Republican Senate has abused their confirmation process to pack the courts at all levels despite knowing that they represent a minority of voters. We are actively considering all options to undue the potential damage to the credibility of our courts and constitutional system."

After the election come out with a very strong proposal to reform or pack the courts and then try to force Republicans to come to the bargaining table for a bipartisan deal. Whether what ever is left of the Republican party comes to the table, will be a reflection of how they interpret the election results.

From my perspective the Republicans are committing political suicide, but we will see where we are in January 2021, 2023, and 2025.