If it helps, I wrote about the limitations of risk matrices as a risk management tool in the attached article. I find Monte Carlo analysis provides a better analytical basis for analyzing risk.
That is a big question that covers a lot of territory. The major benefit to doing risk analysis is to gain a deeper understanding of the relationships between various aspects of a project. I personally place a lot of emphasis on the sensitivity analysis to focus the risk management plan.
It's very simple, all by reducing the number of accidents and occupational diseases. As well as the gravity of the accidents and the improvement of the organization of the various works and tasks.