I am currently doing one project on hydraulic actuator synchronization using mechanical coupling( rigid coupling) as part of my internship. it is cost effective, don't have any complicated controls. just pump the fluid. since it is rigid and the mass is centralized the volume and pressure should be equal to both actuators.

when I was doing my research, I came across so many models which using other techniques like servo valves, but I hardly saw anything about the mechanical coupling., What are the disadvantages of this system?

in ideal case if the load is centered , the pressure and the volume should be equal in both actuators. if that is the case then why there is so many techniques is out there.?

PS- the connection is rigid, the weight is centralized, might have slight leakage (assuming, since it is for practical use)