"Assuming this is correct, why would not setting the direction of travel and then lashing the tiller not achieve the same result?"
Why not?Because you would not be setting the direction of travel but setting the point of direction of the boat relative to the set of the sails at that wind speed in those waves.
The tiller self-steering system however points the boat towards the same point of wind only.{generally}
my 2¢
Why not?Because you would not be setting the direction of travel but setting the point of direction of the boat relative to the set of the sails at that wind speed in those waves.
The tiller self-steering system however points the boat towards the same point of wind only.{generally}
my 2¢