Almost every new system of governance has been better than what came before.

This... is a very selective remembering of history, no?

"Almost every" is a very strong statement. But even granted that, the interregnum periods (civil wars and revolutions) tend to be so horrific that they are wise to avoid. In fact, people like Plato, Machiavelli, and Hobbes who lived through revolutions tended to come to the cynical conclusion that any system of government was better than a civil war. I don't agree with that conclusion, but I'd rather see the system reform itself than jump immediately to "tear up the constitution and start over"

No matter how much you hate Communists, you must admit the fall of the USSR was catastrophic in terms of quality of life and life expectancy. All the public goods and services were sold off en masse and children were driven to prostitution to avoid starvation.

~30 years later all the quick investors of the privatization run the country and have been sending all their able bodied men into a drone-based meat grinder with no end in sight.