My Jazz came from the dealer with the SRVS disabled, I asked to enable it at the first service (20000km, 12500miles, one year). Second service called by the SVRS after 18000km (11200miles) and one year, probably was the year passed to call the service. Third service called by the SVRS after 17500km (10900miles) and 9 months, called by oil wear. Maybe my engine has run with bad oil at the end of the first year, the SVRS would have called the service before... I don't know.
Considering that oil degradation depends by mileage but also by how the car has been used (short or long trips, cold or hot weather, time spent at idle, time spent at full throttle, ....), an oil control system should be used (and followed) in every car. An ECU is definetly better to measure the oil wear than a common user.