What would happen if we didn't have the separation of powers didn't exist?

Without the separation of powers, government authority would be concentrated in a single entity, leading to an imbalance that could foster tyranny and abuse of power. This concentration could undermine individual rights and freedoms, as there would be no independent checks on authority. Additionally, the legislative, executive, and judicial functions would lack the necessary oversight, potentially resulting in arbitrary governance and diminished accountability. Overall, the absence of this separation could severely compromise democratic principles and the rule of law.