The debt ceiling is a relic from the days when it was assumed that balanced budgets were the norm, and the sale of government securities to finance debt would be a rarity. Today, its only purpose is to give Mitch McConnell the ability to blackmail the Democrats. Period.
There is a decent, if not necessarily compelling, argument that the filibuster promotes moderation and a valuable degree of continuity in the Senate. Is that a reason to keep it in place for the debt ceiling? No, because, unlike any other issue that comes before the Senate, there is no case for a public default. Even McConnell acknowledges that; he only values it for tactical purposes.
Since the debt ceiling is just an idiotic blight on our political landscape, removing it from the filibuster should be a simple task; it doesn’t create a precedent for anything. Surely Manchin and Sinema can see that. Right?