Your answer implies that the 2 people up front - don't work together ! Strange though - if they really don't work together then perhaps one of them is totally unnecessary - like the old engineer, who's days were up when the 2 cabin crew was invented.
I wonder if management will ever realise that - if - just if one of the drivers is enough - there is a vast saving about to lurk ?
Only kidding - well sort of - I have heard that the rules and roles in various companies for the 2 drivers vary - quite a bit. How bad are the extreams. ??? Just for the uninitiated SLF's
See your logic about governments - highly unlikely in their case to do anything that improves efficiency - or even go near it.