You got it backwards. They want to eliminate the natural variation to test many different formulas for their treatment. Without clones, it is impossibly to be completely sure if the effects of different formulas are caused by them being different formulas, or the each person’s body just reacted differently.

It would be incredible because you could choose a group of monkeys that have genetic traits you want to test, then clone all of them so that you have multiple of the exact same test environment to test different treatments. It would push medicine rapidly.