[LeifCarrotson]

Same.

I got a call literally last week Tuesday because one of the usual operators had left his position at one of the top 5 US aerospace and defense contractors (other than Raytheon), and they didn't know how to reset the sequence for the machine my employer had built for them less than 10 years ago.

Sure, any controls engineer worth their Ethernet cable would be able to read the PLC code and reverse-engineer it, but the user manual for that machine is about 8 pages of mostly boilerplate and would take an intern about 15 minutes to generate. It would take 50 times as many pages and 500 times as much effort to generate a proper user manual that would guarantee the next operator can read the manuals and fully understand what needs to happen to make good parts.