The ultimate benefit of processes is that they are adaptable. They are living organisms that can be modified as the company grows or changes. Because a structure with preexisting processes is already in place, it is easier to adjust, add, or remove responsibilities as the team grows and evolves.
When a new person joins your company, the current processes can provide the foundation from which you and the team can see what work is being done now and how it can be modified. From there, it is easy to reduce the workload for other members of the team, if necessary, and to assign new responsibilities.