I wonder about that too. For context, I’ve done it, and I wouldn’t do it again without a harness and clipping in. It’s just such a trivially easy thing to do to protect yourself and the cables are not at all adequate for safety.

For me, I didn’t use one because I didn’t realize I’d want it. I knew a ton of people do it daily, knew there wasn’t a lot of discussion or use of harnesses, and I assumed I’d agree with everyone else. And I think for a lot of others there’s that element, plus not even really knowing how easy it is to use one. You certainly are stuck with your decision once you finally make it to the cables, lol.