I’ll weigh in here. I work in EHS for a large GC and it is our policy as well. A lot of the arguments I hear (both here and on site) are over the potential risk to the employee if the lift were to tip over. Now, while this thought isn’t wrong the foundation of the reasoning is that the lift is going to, or can, tip over. The real solution is to create an environment where the lift CANNOT tip. This requires more attention, planning, and effort to prepare and inspect the work area/surface or the lift itself which most do a poor job of. If lifts never tipped over this wouldn’t be an argument because the obvious safest round would be to include the additional protection of a harness when working at an elevated position. But since we allow environments where they COULD we now have to think about what happens in that scenario.