Nobody wrote:Motors have seals and bearings which wear out and can have brushes too depending on motor type. Batteries age and hold less capacity in time. Battery needs to be charged and therefore needs a charger. Contact switches (buttons) wear out. Electronic components (although usually fairly long lived) don't last forever either and can suffer from heat and vibration. Water ingress can cause significant problems with corrosion of electronics.dale79 wrote:please enlighten us DI2 owners what the so called extra complexity and life limits are of the electronics..
Hmmmm, servo motors with brushes are as old fashioned as cable-actuated derailleurs. Batteries and chargers are far from new-fangled either - every household has them in numbers.
All the other potential "issues" you mention - wear, heat, vibration, corrosion apply equally to mechanical systems. You must try harder.