Quite true Greg,
Back in the early days of me being a FF, we would get up on a single storey roof, at night, no fall harness or fall protection.
Start taking roofing iron off to get to the seat of the roof fire, yes it was dangerous (like most of fire-fighting is), but it was more about situational awareness, if you knew you could fall, you were more careful.
That is not an excuse for good retention in a fall harness/retention system, but once you have a BA set on and a fall harness over the top of that, it becomes quite messy with straps heading in all directions.
Everyone on a roof SHOULD have fall protection