The benefits of industrial robots are mostly reflected in routine parts of the work process: the same movements day in, day out knowing that nothing is going to change. Sooner or later this makes people careless, which in turn means unpleasant accidents in the workplace. People are similarly being replaced by industrial robots in jobs that are quite uncomfortable for people to do for some reason. As a rule, uncomfortable movements mean more mistakes are bound to happen, but such mistakes are prevented in the case of a fully functioning industrial robot.
The development costs for industrial robots can be considered quite low compared to production costs. Many manufacturing plants are having trouble finding reliable line workers for classic and routine assembly line jobs, which is where robots come in handy.