Ayurveda approach of individualistic treatment is very scientific as disease condion is very much different in each individual and genetic profile of each individual is different. Further, contemprary science also have concept of pharmacogenetics, which is taken care by Ayurveda while treating any individual. RCTs also have limitation as they are performed in very controlled environment and conditions. Now,scientists are talk more about N of 1 trial. So Ayurveda can not be denied as a science, only Ayurvedic Research design has to be modified accordingly.
But still in ayurveda too many people might be getting the same drug for the similar diagnosis. The doses May differ person to person. Still RCT is possible..