> So Republicans can change the agreed upon rules (norms), lie about it, and then change the rules again, to get what they want while they're in power, but when the Democrats are in power, they have to play by the Republican's rules?
The only agreed upon "rules" are what the legislature passes. "Norms" don't really mean much; those are just glorified pinky promises.
You're basically comparing "norms" to laws, but those two are not the same. The fact that there are 9 justices on the Supreme Court isn't a norm that we all just shake hands and agree on, it's what's currently set by legislation. Mitch McConnell never violated any law, nor did he change the rules via legislation. He (and the GOP) exercised the power to advise and consent (or not) to a nomination. If the people had wanted the kind of nomination he refused to consent to, they would have voted for a different Chief Executive, and a different Senate. But alas, that did not happen; those are the rules of the game.
What you (and the so called "academics") are advocating for is changing the rules of the game. Notwithstanding the merits of that, it is in no way comparable to just playing hardball by the existing rules, and to argue otherwise is pretty disingenuous.