Joysticks use mechanical potentiometer, which are not too reliable. Joysticks are also implemented to control high capital investment equipment.
Failure induces down time costs due to none usage and forced maintenance. Depending on the location of the equipment cost induced can become very high.
One alternative is to use contactless magnetic sensors, which are expensive due to signal processing chips. Standard optical encoder as know in the machine industry are very expensive.
The dicod technology is the right alternative for that application.