> Won't be popular opinion but, one benefit of driverless subway is: decreased risk of industrial action disruptions.

Very true, though equally the increased risk of automated safety system stopping the train in the middle of a long tube tunnel because one of it's sensors got dirty or a rat triggered a sensor as it went splat on the tracks are things drivers can work around easier.

So if a perfectly safe and working train stops due to a sensor getting dirty quickly (which for the London tube is more likely than most places), with a driver there they could see and know that issue and safely carry on. Automation will go into health and safety mode and stop that train in the middle of nowhere needing human attention. So delays become longer.

I'd rather deal with planned outages, than longer drawn out automated random ones.