I have worked on designing small machinery, 3d printers and cnc routers, and on some axis, we use two motors in sync for movement. It is very reliable until it is not, we had times were programming errors or driver failure would unsync the two motors, moving the axis into a triangle. It is very rare like once every 1000 hours, but it does happen. For our bigger machine, were this would cost a lot and could be dangerous, we decided to go old school with full mechanical coupling and bigger motor, we also added second endstops being the optical ones with direct wiring of the general machine switch. The mechanical coupling never failed.

I know it is not really the same type of machine and design, but it still makes me wary that my steering wheel will turn suddenly because of any unforseen reason.