collecting data and making decisions

Using statistics (collecting data and making decisions) helps prevent the number of mistakes or wrong decisions that are made.  By using data, there is a clearer answer to a decision as opposed to going with a gut decision, which may not be consistent for a variety of reasons.  What are your thoughts on using data to make most or all of the decisions for a patient?  After this data is collected and analyzed using the method that was described in the initial question. Do you think it is appropriate to run these kinds of experiments continuously together this kind of information? Or do you think there are downsides to using the scientific method in this way?