Rules of procedure, are how policy gets made. Are you even familiar with Roberts Rules of Order?
en.wikipedia.org
If the last few elections have taught us anything, if you change the rules of elections, you can even manipulate it so, establishment friendly politicians and policy wonks who have been in the system, are more likely to be nominated and elected, than populist candidates from either party. This works to the advantage of global corporations and non-government organizations.
Of course no one is talking policy, when it is all about the boundaries and rules going forward at this point.
That is what this is about. McCarthy just wanted to play the game, by the same rules that Nancy was using. This works well if you are a shill of the corporatacracy, the global elites, and their lobbyists.
On the other hand, if you actually represent folks back in your district? Those rules, generally stink. They aren't good for America or its future.