Vancouver has driverless trains, but you pretty frequently see staff at the stations.
Oddly enough, you almost never see them on the trains unless someone has pushed the silent alarm.
Skytrain is quietly amazing, such a joy to use compared to even other train based metro systems in my opinion.
Fair enough though one doesn't interact much with a subway driver.
On the flip side, I've seen "funny" videos from Japan where there is staff at the stations who push passengers in to fit everyone as much as possible?
I used to think that was crazy until I started using the metro every day. There will be a hundred people packed by the doors and the few people in the middle of the car don't think to compress a little. Suddenly I wanted those staff to come in and make the ride more equitable!