Maybe you want your lift to be able to diagnose itself. Tell possible faults, instead of spending man hours on troubleshooting every part each time downtime included. With big lifts there are many parts that could go wrong. Being able to identify which one saves lot of time and time is money.
These sort of outages are actually extremely rare nowadays. Considering how long these control systems have been kept around must mean that they are not actually causing that many issue that replacing them would be worth it.
