But it does have relevance to any job.While I understand where you are coming from this has little relevance to say a residential electrical company doing new construction.
Procedures for any business are generally unique to that business and most won't be useful to a company operating in a different speciality.
Bottom line, a company would have to detail SOPs to their specific need.
Doesn't matter if it's residential, commercial or industrial.
I'm sure we all have a set of steps we follow for any job.
Do you pull NM cable before you drill holes?
Most likely not, because there is a set of steps to be followed, otherwise known as an SOP.
With a well written SOP, you could hand to someone who has basic skills and they could follow the steps and accomplish the task.
Of course, the best way to teach someone, is to show them how.