Luo'er was somewhat like a hen protecting her chicks, willing to shelter his team under his wings and keep them safe, even if it meant that he would be hurt, but he was reluctant to let them face danger.
For him, as long as his team members obediently followed his orders and faithfully completed their tasks, that was enough. He didn't need a lot of differing opinions. Although he listened to his team's suggestions, the orders were always given by him.
Cheng Ziang was able to strategize for the team simply because he was capable of making decisions, something that not even Luo'er could overlook. Hence, a portion of power was allocated to him. If there were to be another decision maker, Luo'er would very likely be overwhelmed because the system established around him would fall apart.