Also a good point. Most of the IT PMs had no idea how IT worked and that was disastrous.YES. The only PMs I've ever worked well with were ones that came up in the environments they're now managing.
Client: We want biometric scanning using only the mouse.
PM: Okay, I promise that IT will have that done next week.
People in accounting, sales, support, janitorial services, customer service, etc all will have similar stories.