What is the advantage of building a legion in battle compared to the Macedonian phalanx?

When the Macedonian phalanx lined up, the warriors lined up in long rows, turning their spears and shields to one side. When the enemy attacked from the rear, they could turn around and repel the attack. But from attacks from the flanks, the Macedonian phalanx of the ball is defenseless. The Roman legions lined up in a rectangle, which allowed the soldiers to defend themselves with Shiite walls from all sides, and are not afraid of attacks from either the front, rear or flanks. It was thanks to this that the warriors were almost invulnerable. In the event of an attack by archers, they could line up in a turtle, raising their shields above their heads, which completely protected them from arrows. It was this construction, according to historians, that made the armies of Rome invincible.