Why is ammonia removed as it forms during the Haber-Bosch process?

In the Haber-Bosch process, ammonia is removed from the reaction mixture as soon as it is formed to ensure that an equilibrium favoring product formation is maintained.1

The synthesis of ammonia from nitrogen and hydrogen is a reversible reaction. By continuously removing the ammonia product, the system is prevented from reaching a state where the reverse reaction—the decomposition of ammonia back into its constituent elements—could occur at a rate that offsets production. This removal effectively shifts the equilibrium toward the continuous generation of more ammonia, thereby maximizing the yield of the process.1