Actually, that's an interesting point.
At a basic level, it's just a linear actuator, a sensor or two, some buttons, a power source and a microcontroller. Assuming comparable manufacturing costs due to economies of scale, it doesn't seem outside the realms of possibility that a Tourney-level electronic groupset would work better for longer than a mechanical one, purely because it could automatically recalibrate itself to compensate for the slop and wear in cheap mechanical parts.
Of course it would be unserviceable throw-away sealed units, but that's what people are used to these days, and is standard treatment for low end bikes as a whole. People running Tourney groupsets generally don't know how to adjust gears properly anyway, so automating that would be a major advantage.
