[idiotsecant]

In the motion control and process control industries deterministic systems or SISO systems like PID are typically considered in what someone would just call 'controls'. Advanced process control is an actual industry three-letter acronym term relating to 'meta-controls' where the controller is itself controlled by an outside system like the supply chain or a plant tuning system, etc. This is the point I was trying to make - i'm not making a judgement call on what is or is not sufficiently 'advanced' only pointing out that this term has a meaning that the parent post I was replying to might not have understood.