(repeating a story)
the finest reporter I ever met entered journalism from her job as a PI in Detroit. She won that job over a game of pool.
Takes a certain tenacity to hold a story to its end. Actual investigative reporting is expensive.
Standard reporter issue notebooks are/were slender. Every reporter at every newspaper I ever saw had boxes of those notebooks, kept in apparent perpetuity in the event of legal stuff. The bulk of what's in there are names spelled correctly, quotations accurately recorded, and of course anything to assist recall. Wherever you've been doesn't matter when you're sitting at a desk banging out copy to your editor's spec. Seven, eight stories on deadline is when the newsroom is running full tilt. Go home, come back and do it again.
A reporter who is <ahem> promoted to editor, I imagine is very much like an enlisted man being promoted to officer rank. Folks who were friendly may not be so friendly now, and folks who used to be pretty unfriendly are friendly. Editors who are friendly with the folk in the composing room are probably on the endangered species list.
Leaving the editor's desk for other pursuits is another story.