@A_B what if it pegs the rudder? Why would it need "full" control of the rudder? Planes have auto pilot, ships have autopilot, small yachts have autopilot, bass boats have auto pilot, we put the boat on ZO cruise control which has no mechanical safety what if ZO just chose to go full throttle on you as you were coming into the dock yet we use that. PP for instance was failsafe. If PP freaked out and tried to go full throttle it just took all the slack out of the cable and then your boat went whatever the throttle was set to.
If you just took the cable where it attaches to the rudder arm and installed a servo right there that rotates the connection point on the rudder arm some small amount the driver would still drive but the course would be corrected coming into the gates the boat would find the center line. Going down the course the boat would attempt to maintain center and you could give the driver the equivalent of the PP "More throttle" which would just display that the driver needs to move the wheel left or right. Maybe the system can only engage if the driver moves the steering wheel is within 10 degrees either side of straight ahead and beyond that it disengages.
So many easy ways to design around this in a way that would make skiing better, safer, less fatiguing and then we sell this to every open water ski enthusiast, the boat will go dead nuts straight when engaged + at constant speed unless the steering wheel deviates by more than 10 degrees from center. How many times has your buddy treated you like a tuber and you don't want to complain because its his boat....
"fun out of it if you enjoy being a good driver" sure I support that maybe if a skier wants their driver to give them a hand throttled pass with a stop watch timer they should be able to opt in for it must be in tolerance and no re-rides given for out of tolerance. Wonder how many skiers will opt in for the pass.