Aside from improving manufacturing speed, technology has improved precision and accuracy in production. The human senses can only assist an engineer very far before factors such as fatigue, boredom, and other physiological interruptions kick in. Moreover, manufacturing usually involves handling dangerous working environments such as furnaces, poisonous fluids, and harmful metals.
Using control tools such as programmable logic controls (PLCs) and numerical controls (NCs) manufacturers can automate the production processes. With these technologies, manufacturers can produce polished products that are durable and resilient to physical or chemical impact. These technologies have been studied and implemented to create products with specifications that you cannot achieve in any other way.