Again, the pitfalls happen if it's not an essential duty to talk about the upkeep of the facility, the environment and health and safety. The risk is that the law doesn't have the teeth it needs.
Any legislation that is legislation that doesn't work, like the Westray Law doesn't work, is ineffective. To give it effect, to give it bargaining table effect, it must, again, limit the number of workers with no shortcuts and no loopholes.