>completely disconnecting is the mark of a professional.

Slight nitpick, but this is the mark of a person with a vocation. A "professional" answers to a higher ethical calling. The name derives from "professing" an oath; for example, for a doctor to "do no harm" or an engineer to work in the public good. This can occur within a 9-5 window, but I would expect that, if needed, a professional would put their oath above clock hours if it was in conflict.