Accurately simulating biological systems in the cloud to run a virtual clinical trial is like trying to predict the exact weather for Washington DC at a specific date and time hundreds of years from now using weather forecast models. It’s pretty much impossible with current biomedical knowledge.

To simulate humans well enough to eliminate a clinical trial, you would have to simulate every single cell, organ, and organ system as well as the substantial population of bacterial and fungal microorganisms that live on and inside humans (as well as all their unique biology too). Building such a simulation would require a level of knowledge of biology that the human race currently does not possess.