The big difference is that the Republicans HAVEN’T cheated. They are certainly playing hardball, but appointing a judge in the last year of a Presidency has been done something like 16 times before. They are actually following precedent.
Packjng the court is on a whole other level. It would essentially destroy the legitimacy of the court, and i vite Republicans to do the same if they get back in power, which would further destroy the court.
If Democrats hold the House, the Senate, and the Presidency, packjng the court with partisans to essentially nullify it could trigger an uprising of states, a constitutional convention, or a civil war. It’s a step WAY beyond what either party has done before.
To do it, the Democrats would also lkkely have to abolish the legislative filibuster, which would result in massive swings in government policies every time the senate flippedvby one vote. It would raise the political stakes on every election, and make things much worse.
You criticize Trump for breaking norms, as you should. If you advocate packing the court, you’d be guilty of breaking norms Trump never dreamed of. You might as well set fire to the Constitution while you are at it. And prepare for what comes next, which will not be pretty.