The world needs to know the specific types of mutations that had occurred in the outbreak in China, which obviously they can't get from the "five billion" other people "out there" in the rest of the world. And they need to know that because, when these mutations inevitably make their way outside of China, the rest of the world needs to know what may be the potential effects and how to prepare for it.

This isn't a request that is specific to China. This is expected from all other countries when a new variant potentially arises. No country should be allowed to keep their outbreak data secret for the safety of the world.