If you leave the treatment criteria the same, then yes, you are absolutely right. But you have to adjust those, too. Just a made-up example: Let's say someone

If you leave the treatment criteria the same, then yes, you are absolutely right. But you have to adjust those, too. Just a made-up example: Let's say someone has an advanced test for cancer run, and it comes back positive. You know from studies that treating people the same way as before with the advanced test leads to worse outcomes because of unneccessary treatment etc.. So what you could do is you do the simpler test afterwards. If it comes back negative, you don't treat -> you are in the same situation as before, only you can be more vigilant in future and see if the cancer grows. If the simpler test also comes back positive, you do the treatment. It's all about getting data (statistical and otherwise) on what the best treatment is, and acting on that.