Anyone who has had to do with the manufacturing side of car makers (German ones anyway) knows how highly optimized from end-to-end their processes are. It seems doubtful that anyone could leapfrog this amount of accumulated process knowledge and optimization simply by way of being new.
Automation is not a black-and-white thing, either, as it is often portrayed. Sure, some things are fully automated (e.g. assembling the car body), but many things are partially automated. For example, there is a tool which is essentially 5/6/7 torque wrenches coupled to a lifting arm. This tool allows a line worker to mount a tire with little physical exertion in seconds. You see this sort of thing all the time at car assembly lines; offloading mechanical power to the machine, while having a human line up and steer things. (This also avoids a whole bunch of safety concerns you normally have when operating autonomous equipment in the same physical space occupied by humans)
Another example: The body of virtually any car is self-supporting (there is no frame), so getting it right is rather critical. To achieve both the high strength and low weight of a modern car body the steel is deformed very closely to the maximum deformation it can withstand. This needs very good matching of the process to the steel. So, the manufacturer of the steel coil tests each coil individually for its exact properties. For mass production lines only coils meeting very tight tolerances are used. For low volume lines the process is adjusted individually for each coil based on the manufacturers testing and some in-house testing.
Automation is not a black-and-white thing, either, as it is often portrayed. Sure, some things are fully automated (e.g. assembling the car body), but many things are partially automated. For example, there is a tool which is essentially 5/6/7 torque wrenches coupled to a lifting arm. This tool allows a line worker to mount a tire with little physical exertion in seconds. You see this sort of thing all the time at car assembly lines; offloading mechanical power to the machine, while having a human line up and steer things. (This also avoids a whole bunch of safety concerns you normally have when operating autonomous equipment in the same physical space occupied by humans)
Another example: The body of virtually any car is self-supporting (there is no frame), so getting it right is rather critical. To achieve both the high strength and low weight of a modern car body the steel is deformed very closely to the maximum deformation it can withstand. This needs very good matching of the process to the steel. So, the manufacturer of the steel coil tests each coil individually for its exact properties. For mass production lines only coils meeting very tight tolerances are used. For low volume lines the process is adjusted individually for each coil based on the manufacturers testing and some in-house testing.