A plant is already instrumented. PLCs log every stop, the MES holds the production order, the CMMS holds the work order history, and the quality department has years of inspection records. What is missing is the join between them, so the downtime code entered at end of shift never meets the process parameter that caused it, and the escaped defect never meets the tool life it correlates with.
Vision is where most plants see the first honest return. Surface defects on castings, weave faults, missing components, wrong labels, seal integrity — all judged today by a person under time pressure, sampling rather than checking. A camera and a model trained on your own reject bin can check everything at line rate and route the borderline units to that same person, who is now spending their attention where it changes the outcome.
The second return is knowledge. SOPs, maintenance manuals, drawings, past 8Ds and CAPAs and the supervisor's memory are the plant's real operating system, and most of it is not retrievable at 2am on a night shift. A private assistant over that corpus, with the source document cited, is what keeps a new technician from guessing.