From what I understand, there are increases in efficiency due (in part) to the ability of machines to run at all hours, helping manufacturers to work with delayed and unpredictable supply chains. Also due to reducing tiresome, back-breaking manual labor.

It increases the efficiency (that is, reduces waste) of the use of raw materials in production. In some circumstances, it probably does replace a small number of human workers, but that's not its main effect and isn't the source of the savings our customers get from it. It's mostly doing a job that wasn't being done before.