The point is that the powers that be have realised that despite constant training, supervision etc the workforce out here are liable to stand on guardrails etc so if they have a harness, dont clip on and subsequently fall off by their own stupidity all that is reasonably practicable to keep them safe has been done.
I wasn't being disparaging to how anybody handles keeping the guy's safe, but some of these incentives seem crazy to me. Surely reasonably practicable would be a platform at the correct height, fitted with hand rails.