It’s just much easier to reform a contract (constitution) that is adjudicated by an independent judiciary, than it is to reform a dictatorship, oligarchy, bureaucracy, or theocracy that lacks an independent judiciary and constitutional means of decision making given a division of powers, and fundamental rights especially to property.
Most of western history is the difficulty in maintaining our rule of law from attempts to usurp it by the aristocracy, the theocracy, the burghers, and now the underclass communists, devoted, and socialists.
A constitution if well written is an algorithm for the operation of a polity under falsification, tested before judges who are not involved in the operations of whatever function is in conflict.